Can anyone recommend an ATA with really good echo cancellation?
My SPA-3000 has never crashed, but echo cancellation has always been a
bit poor (particularly at the remote caller's end), and dependent on
audio gain levels set in the poorly-documented, over-complex web GUI. A
while back I upgraded to the current V3 firmware, which hasn't really
helped. So I wondered whether a more modern ATA box would have better
echo cancellation.
I only need 1*Ethernet port and 1xFXS port, as I have a London 8 PABX
that can be configured as 2+6. But an ATA with 1*Ethernet, 1*FXS, 1*FXO
would be more flexible, if slightly more complex.
What do people reckon to the Cisco ATA 186? I'm used to configuring
Cisco routers and switches, and Cisco kit tends to be very reliable.
Seems to be around the UKP 112 mark.
Also - any comments on the FRITZ!Box Fon ATA? Seems hard to find in the
UK (even from the websites listed on AVM's site as resellers). Has it
been discontinued?
> My SPA-3000 has never crashed, but echo cancellation has always been a bit
> poor (particularly at the remote caller's end), and dependent on audio
> gain levels set in the poorly-documented, over-complex web GUI.
Martin,
Maybe you tried this already, and maybe you're already tired of trying stuff
with the SPA-3000 already, but you might want to try different line
impedance configurations in the SPA-configuration, this does have an effect
on the echo canceller.
Trying another analog phone also sometimes help, the local echo canceller
(which is the one that causes the echo at the remote site) sometimes can't
cope very well with specific (cheaper) phones, or a lot of phones parallel.
Christian wrote:
>> My SPA-3000 has never crashed, but echo cancellation has always been a bit
>> poor (particularly at the remote caller's end), and dependent on audio
>> gain levels set in the poorly-documented, over-complex web GUI.
>
> Martin,
>
> Maybe you tried this already, and maybe you're already tired of trying stuff
> with the SPA-3000 already, but you might want to try different line
> impedance configurations in the SPA-configuration, this does have an effect
> on the echo canceller.
>
> Trying another analog phone also sometimes help, the local echo canceller
> (which is the one that causes the echo at the remote site) sometimes can't
> cope very well with specific (cheaper) phones, or a lot of phones parallel.
>
> Christian
>
>
I see lots of similar problems with my SPA-3002. Most of the time it is
OK and then it seems to start playing up, both on VOIP and PSTN. The ATA
is so complicated it is always possible to say other setting will fix
the problem. I don't know how many hours I have spent trying to get it
right.
My solution will be to get a Siemens C475IP or maybe the similar SNOM
M3. I'm only holding back while I try and work out what P2P is doing to
mess my router up.
Christian wrote:
>> My SPA-3000 has never crashed, but echo cancellation has always been a bit
>> poor (particularly at the remote caller's end), and dependent on audio
>> gain levels set in the poorly-documented, over-complex web GUI.
>
> Martin,
>
> Maybe you tried this already, and maybe you're already tired of trying stuff
> with the SPA-3000 already, but you might want to try different line
> impedance configurations in the SPA-configuration, this does have an effect
> on the echo canceller.
>
> Trying another analog phone also sometimes help, the local echo canceller
> (which is the one that causes the echo at the remote site) sometimes can't
> cope very well with specific (cheaper) phones, or a lot of phones parallel.
Thanks for the idea, I'll give it a go.
In fact I have lots of different, vintage handsets running from the
PABX, so I'm not making life easy for myself ;-)
Martin Johnson schreef:
> Can anyone recommend an ATA with really good echo cancellation?
>
> My SPA-3000 has never crashed, but echo cancellation has always been a
> bit poor (particularly at the remote caller's end), and dependent on
> audio gain levels set in the poorly-documented, over-complex web GUI. A
> while back I upgraded to the current V3 firmware, which hasn't really
> helped. So I wondered whether a more modern ATA box would have better
> echo cancellation.
>
> I only need 1*Ethernet port and 1xFXS port, as I have a London 8 PABX
> that can be configured as 2+6. But an ATA with 1*Ethernet, 1*FXS, 1*FXO
> would be more flexible, if slightly more complex.
>
> What do people reckon to the Cisco ATA 186? I'm used to configuring
> Cisco routers and switches, and Cisco kit tends to be very reliable.
> Seems to be around the UKP 112 mark.
>
> Also - any comments on the FRITZ!Box Fon ATA? Seems hard to find in the
> UK (even from the websites listed on AVM's site as resellers). Has it
> been discontinued?
>
> Thanks for any info!
>
> - Martin.
The Germans use a annexB type of fritzbox, in holland there are several
sites where you can order a Fritz!box 7170,(annexA) great thing, has
much features, don't expect a pro GUI webinterface, it's meant for the
layman, and is easy to set, and has some very advanced features,(USB
port for storage, printer... and softswitch options) which are far more
easier to set, then a cisco/linksys device.
"Martin Johnson" <user@example.net> wrote in message
news:EO-dnbNl5Ib85bjVnZ2dnUVZ_v7inZ2d@supernews.com...
> Christian wrote:
>>> My SPA-3000 has never crashed, but echo cancellation has always been a
>>> bit poor (particularly at the remote caller's end), and dependent on
>>> audio gain levels set in the poorly-documented, over-complex web GUI.
>>
>> Martin,
>>
>> Maybe you tried this already, and maybe you're already tired of trying
>> stuff with the SPA-3000 already, but you might want to try different line
>> impedance configurations in the SPA-configuration, this does have an
>> effect on the echo canceller.
>>
>> Trying another analog phone also sometimes help, the local echo canceller
>> (which is the one that causes the echo at the remote site) sometimes
>> can't cope very well with specific (cheaper) phones, or a lot of phones
>> parallel.
>
> Thanks for the idea, I'll give it a go.
>
> In fact I have lots of different, vintage handsets running from the PABX,
> so I'm not making life easy for myself ;-)
>
>
> - Martin.
The correct impedance setting for UK telephones/pabx lines is:
steveybar wrote:
> "Martin Johnson" <user@example.net> wrote in message
> news:EO-dnbNl5Ib85bjVnZ2dnUVZ_v7inZ2d@supernews.com...
>> Christian wrote:
>>>> My SPA-3000 has never crashed, but echo cancellation has always been a
>>>> bit poor (particularly at the remote caller's end), and dependent on
>>>> audio gain levels set in the poorly-documented, over-complex web GUI.
>>> Martin,
>>>
>>> Maybe you tried this already, and maybe you're already tired of trying
>>> stuff with the SPA-3000 already, but you might want to try different line
>>> impedance configurations in the SPA-configuration, this does have an
>>> effect on the echo canceller.
>>>
>>> Trying another analog phone also sometimes help, the local echo canceller
>>> (which is the one that causes the echo at the remote site) sometimes
>>> can't cope very well with specific (cheaper) phones, or a lot of phones
>>> parallel.
>> Thanks for the idea, I'll give it a go.
>>
>> In fact I have lots of different, vintage handsets running from the PABX,
>> so I'm not making life easy for myself ;-)
>>
>>
>> - Martin.
>
> The correct impedance setting for UK telephones/pabx lines is:
>
> 370+620||310nF
>
> best wishes - Steve.
Thanks.. I seem to have that already, under Regional / Miscellaneous /
FXS Port Impedance.
But, in the same config page (under /admin/advanced) I've just noticed a
box marked "More Echo Suppression: No". I will try setting this to Yes
for a bit and see what happens.
> My solution will be to get a Siemens C475IP or maybe the similar
> SNOM M3.
To be honest, that is exactly what I did (an S450IP in my case). The
advantage of a real VOIP-phone rather than an ATA is that the sent and
received signal never meet each other on a single line. The only echo will
be caused acoustically in the handset. So the chance of echo on the far end
is reduced quite a lot. I never had any complaints about echo anymore (I did
have some with my SPA3000, although not often).
Christian wrote:
>> My solution will be to get a Siemens C475IP or maybe the similar
>> SNOM M3.
>
> To be honest, that is exactly what I did (an S450IP in my case). The
> advantage of a real VOIP-phone rather than an ATA is that the sent and
> received signal never meet each other on a single line. The only echo will
> be caused acoustically in the handset. So the chance of echo on the far end
> is reduced quite a lot. I never had any complaints about echo anymore (I did
> have some with my SPA3000, although not often).
I have a local PSTN number on my Gradwell VOIP service, so that PSTN
callers in my own town don't need to dial an area code to call me.
After turning down the SPA3000 gain settings a while back, I _think_ I
only now get complaints about echo from callers in my own town, as if
BT's audio gain was higher for such callers. Is it possible that the
audio gain in the BT network is routing-dependent, or is it more likely
to just be coincidence?
Martin Johnson explained on 10/05/2008 :
> Christian wrote:
>>> My solution will be to get a Siemens C475IP or maybe the similar
>>> SNOM M3.
>>
>> To be honest, that is exactly what I did (an S450IP in my case). The
>> advantage of a real VOIP-phone rather than an ATA is that the sent and
>> received signal never meet each other on a single line. The only echo will
>> be caused acoustically in the handset. So the chance of echo on the far end
>> is reduced quite a lot. I never had any complaints about echo anymore (I
>> did have some with my SPA3000, although not often).
>
> I have a local PSTN number on my Gradwell VOIP service, so that PSTN callers
> in my own town don't need to dial an area code to call me.
Right, I've been reading this thread thinking you've got echo problems
on the PSTN side of the SPA3000.
What you're actually saying is it's a VoIP account that's suffering the
echo..
>
> After turning down the SPA3000 gain settings a while back, I _think_ I only
> now get complaints about echo from callers in my own town, as if BT's audio
> gain was higher for such callers. Is it possible that the audio gain in the
> BT network is routing-dependent, or is it more likely to just be coincidence?
>
> - Martin.
Martin Johnson schreef:
> Christian wrote:
>>> My solution will be to get a Siemens C475IP or maybe the similar
>>> SNOM M3.
>>
>> To be honest, that is exactly what I did (an S450IP in my case). The
>> advantage of a real VOIP-phone rather than an ATA is that the sent and
>> received signal never meet each other on a single line. The only echo
>> will be caused acoustically in the handset. So the chance of echo on
>> the far end is reduced quite a lot. I never had any complaints about
>> echo anymore (I did have some with my SPA3000, although not often).
>
> I have a local PSTN number on my Gradwell VOIP service, so that PSTN
> callers in my own town don't need to dial an area code to call me.
>
> After turning down the SPA3000 gain settings a while back, I _think_ I
> only now get complaints about echo from callers in my own town, as if
> BT's audio gain was higher for such callers. Is it possible that the
> audio gain in the BT network is routing-dependent, or is it more likely
> to just be coincidence?
>
> - Martin.
You turning down the audio gain, makes BT turning it up ?
isn't there a call-smart setting possible in your situation ?
Jono wrote:
> Martin Johnson explained on 10/05/2008 :
>> Christian wrote:
>>>> My solution will be to get a Siemens C475IP or maybe the similar
>>>> SNOM M3.
>>>
>>> To be honest, that is exactly what I did (an S450IP in my case). The
>>> advantage of a real VOIP-phone rather than an ATA is that the sent
>>> and received signal never meet each other on a single line. The only
>>> echo will be caused acoustically in the handset. So the chance of
>>> echo on the far end is reduced quite a lot. I never had any
>>> complaints about echo anymore (I did have some with my SPA3000,
>>> although not often).
>>
>> I have a local PSTN number on my Gradwell VOIP service, so that PSTN
>> callers in my own town don't need to dial an area code to call me.
>
> Right, I've been reading this thread thinking you've got echo problems
> on the PSTN side of the SPA3000.
>
> What you're actually saying is it's a VoIP account that's suffering the
> echo..
Yes, since I mostly only use the VOIP account.
In fact, the echo is much worse on calls to the analog BT line, but I
only give out the VOIP number.
Martin Johnson used his keyboard to write :
> Jono wrote:
>> Martin Johnson explained on 10/05/2008 :
>>> Christian wrote:
>>>>> My solution will be to get a Siemens C475IP or maybe the similar
>>>>> SNOM M3.
>>>>
>>>> To be honest, that is exactly what I did (an S450IP in my case). The
>>>> advantage of a real VOIP-phone rather than an ATA is that the sent and
>>>> received signal never meet each other on a single line. The only echo
>>>> will be caused acoustically in the handset. So the chance of echo on the
>>>> far end is reduced quite a lot. I never had any complaints about echo
>>>> anymore (I did have some with my SPA3000, although not often).
>>>
>>> I have a local PSTN number on my Gradwell VOIP service, so that PSTN
>>> callers in my own town don't need to dial an area code to call me.
>>
>> Right, I've been reading this thread thinking you've got echo problems on
>> the PSTN side of the SPA3000.
>>
>> What you're actually saying is it's a VoIP account that's suffering the
>> echo..
>
> Yes, since I mostly only use the VOIP account.
I've got a couple of SPA3000s. Both are acting as PSTN trunks on my PBX
and also as regular ATAs.
I get the old echo on PSTN calls but not on VoIP calls.
>
> In fact, the echo is much worse on calls to the analog BT line, but I only
> give out the VOIP number.
On Sat, 10 May 2008 12:40:33 +0200, TheFug <nosp@mplea.ze> wrote:
>Martin Johnson schreef:
>> Can anyone recommend an ATA with really good echo cancellation?
>>
>> My SPA-3000 has never crashed, but echo cancellation has always been a
>> bit poor (particularly at the remote caller's end), and dependent on
>> audio gain levels set in the poorly-documented, over-complex web GUI. A
>> while back I upgraded to the current V3 firmware, which hasn't really
>> helped. So I wondered whether a more modern ATA box would have better
>> echo cancellation.
>>
>> I only need 1*Ethernet port and 1xFXS port, as I have a London 8 PABX
>> that can be configured as 2+6. But an ATA with 1*Ethernet, 1*FXS, 1*FXO
>> would be more flexible, if slightly more complex.
>>
>> What do people reckon to the Cisco ATA 186? I'm used to configuring
>> Cisco routers and switches, and Cisco kit tends to be very reliable.
>> Seems to be around the UKP 112 mark.
>>
>> Also - any comments on the FRITZ!Box Fon ATA? Seems hard to find in the
>> UK (even from the websites listed on AVM's site as resellers). Has it
>> been discontinued?
>>
>> Thanks for any info!
>>
>> - Martin.
>
>The Germans use a annexB type of fritzbox, in holland there are several
>sites where you can order a Fritz!box 7170,(annexA) great thing, has
>much features, don't expect a pro GUI webinterface, it's meant for the
>layman, and is easy to set, and has some very advanced features,(USB
>port for storage, printer... and softswitch options) which are far more
>easier to set, then a cisco/linksys device.
You asked in your original post about the Fritzbox.
I have one and I also have an SPA-3000.
I would say that the Fritzbox performs well and is much easier to get
up and running, for the average person, than the SPA-3000.
However, for me, I would have the SPA-3000 every time.
My prime reason for saying this is the ability to customise the
dialling experience via the dial plan. In its effort to be simple the
Fritzbox loses out in this area. I have hardly used my Fritzbox 7140
but I am considering selling it just for this reason - so any offers
by email greatfully received.
Personally, I have experienced little trouble with echo on either my
SPA-3000 or the two SPA-3102 that I have set up for others.
It is important to get the line impedance set correctly - then I just
tweak the gain, as appropriate, and switch on the echo cancelling
options.
On a separate topic, not wishing to hijack the thread...
I remotely control one of the SPA-3102 so that I can sort out any
problems from home. I have found that it is impossible to get the web
'Voice' control interface to come up correctly on a Windows XP Pro
platform using Firefox, Opera or MSIE 7.
The problem I get is that all the tab contents displayed under each
other, in one long list, and then the egg timer just hangs as if
waiting for more data. I have tried emptying the RAM and disk cache to
no avail. I am aware that this web interface uses javascript so there
may be some problem there though I don't think that is the problem.
In Ubuntu Linux it will display OK most of the time but sometimes the
page needs to be loaded again for a correct display. So, I am tied to
booting up in Ubuntu if I want to access the SPA-3102 remotely.
Any ideas on this one?
Brian A schreef:
> On Sat, 10 May 2008 12:40:33 +0200, TheFug <nosp@mplea.ze> wrote:
>
>> Martin Johnson schreef:
>>> Can anyone recommend an ATA with really good echo cancellation?
>>>
>>> My SPA-3000 has never crashed, but echo cancellation has always been a
>>> bit poor (particularly at the remote caller's end), and dependent on
>>> audio gain levels set in the poorly-documented, over-complex web GUI. A
>>> while back I upgraded to the current V3 firmware, which hasn't really
>>> helped. So I wondered whether a more modern ATA box would have better
>>> echo cancellation.
>>>
>>> I only need 1*Ethernet port and 1xFXS port, as I have a London 8 PABX
>>> that can be configured as 2+6. But an ATA with 1*Ethernet, 1*FXS, 1*FXO
>>> would be more flexible, if slightly more complex.
>>>
>>> What do people reckon to the Cisco ATA 186? I'm used to configuring
>>> Cisco routers and switches, and Cisco kit tends to be very reliable.
>>> Seems to be around the UKP 112 mark.
>>>
>>> Also - any comments on the FRITZ!Box Fon ATA? Seems hard to find in the
>>> UK (even from the websites listed on AVM's site as resellers). Has it
>>> been discontinued?
>>>
>>> Thanks for any info!
>>>
>>> - Martin.
>> The Germans use a annexB type of fritzbox, in holland there are several
>> sites where you can order a Fritz!box 7170,(annexA) great thing, has
>> much features, don't expect a pro GUI webinterface, it's meant for the
>> layman, and is easy to set, and has some very advanced features,(USB
>> port for storage, printer... and softswitch options) which are far more
>> easier to set, then a cisco/linksys device.
> You asked in your original post about the Fritzbox.
> I have one and I also have an SPA-3000.
> I would say that the Fritzbox performs well and is much easier to get
> up and running, for the average person, than the SPA-3000.
> However, for me, I would have the SPA-3000 every time.
> My prime reason for saying this is the ability to customise the
> dialling experience via the dial plan. In its effort to be simple the
> Fritzbox loses out in this area. I have hardly used my Fritzbox 7140
> but I am considering selling it just for this reason - so any offers
> by email greatfully received.
> Personally, I have experienced little trouble with echo on either my
> SPA-3000 or the two SPA-3102 that I have set up for others.
> It is important to get the line impedance set correctly - then I just
> tweak the gain, as appropriate, and switch on the echo cancelling
> options.
>
> On a separate topic, not wishing to hijack the thread...
> I remotely control one of the SPA-3102 so that I can sort out any
> problems from home. I have found that it is impossible to get the web
> 'Voice' control interface to come up correctly on a Windows XP Pro
> platform using Firefox, Opera or MSIE 7.
> The problem I get is that all the tab contents displayed under each
> other, in one long list, and then the egg timer just hangs as if
> waiting for more data. I have tried emptying the RAM and disk cache to
> no avail. I am aware that this web interface uses javascript so there
> may be some problem there though I don't think that is the problem.
> In Ubuntu Linux it will display OK most of the time but sometimes the
> page needs to be loaded again for a correct display. So, I am tied to
> booting up in Ubuntu if I want to access the SPA-3102 remotely.
> Any ideas on this one?
>
>
>
> ---
> Remove 'no_spam_' from email address.
> ---
So i guess you already overcome the problem of accessing the 3102
webinterface, i thought i had setup it correctly to do so, but i only
had access when the pc was straight plugged into the 3102, not both via
LAN :( what's the secret ?
TheFug formulated on Sunday :
> So i guess you already overcome the problem of accessing the 3102
> webinterface, i thought i had setup it correctly to do so, but i only had
> access when the pc was straight plugged into the 3102, not both via LAN :(
> what's the secret ?
Follow the instructions here, if I've understood your question
correctly.
It happens that Brian A formulated :
> On a separate topic, not wishing to hijack the thread...
> I remotely control one of the SPA-3102 so that I can sort out any
> problems from home. I have found that it is impossible to get the web
> 'Voice' control interface to come up correctly on a Windows XP Pro
> platform using Firefox, Opera or MSIE 7.
> The problem I get is that all the tab contents displayed under each
> other, in one long list, and then the egg timer just hangs as if
> waiting for more data. I have tried emptying the RAM and disk cache to
> no avail. I am aware that this web interface uses javascript so there
> may be some problem there though I don't think that is the problem.
> In Ubuntu Linux it will display OK most of the time but sometimes the
> page needs to be loaded again for a correct display. So, I am tied to
> booting up in Ubuntu if I want to access the SPA-3102 remotely.
> Any ideas on this one?
I have similar problems with an SPA1001 & SPA3000; the advanced log-in
yields one long vertical page covering all the tabs with bits missing.
I overcame this by using a VPN at one site and Remote Desktop at
another.
> You asked in your original post about the Fritzbox.
> I have one and I also have an SPA-3000.
> I would say that the Fritzbox performs well and is much easier to get
> up and running, for the average person, than the SPA-3000.
> However, for me, I would have the SPA-3000 every time.
> My prime reason for saying this is the ability to customise the
> dialling experience via the dial plan. In its effort to be simple the
> Fritzbox loses out in this area. I have hardly used my Fritzbox 7140
> but I am considering selling it just for this reason - so any offers
> by email greatfully received.
> Personally, I have experienced little trouble with echo on either my
> SPA-3000 or the two SPA-3102 that I have set up for others.
> It is important to get the line impedance set correctly - then I just
> tweak the gain, as appropriate, and switch on the echo cancelling
> options.
Thanks for that.
> On a separate topic, not wishing to hijack the thread...
> I remotely control one of the SPA-3102 so that I can sort out any
> problems from home. I have found that it is impossible to get the web
> 'Voice' control interface to come up correctly on a Windows XP Pro
> platform using Firefox, Opera or MSIE 7.
> The problem I get is that all the tab contents displayed under each
> other, in one long list, and then the egg timer just hangs as if
> waiting for more data. I have tried emptying the RAM and disk cache to
> no avail. I am aware that this web interface uses javascript so there
> may be some problem there though I don't think that is the problem.
> In Ubuntu Linux it will display OK most of the time but sometimes the
> page needs to be loaded again for a correct display.
This has the sound of an MTU problem to me. I would monitor your
network traffic with WireShark and watch what happens when it stalls.
And/or, try temporarily reducing your client's MTU to something like
512. That's not a fix, but if it temporarily solves the problem, you
can then examine the network to try to see what's causing it.
>> Martin Johnson explained on 10/05/2008 :
>> In fact, the echo is much worse on calls to the analog BT line, but I
>> only give out the VOIP number.
> Frustratingly so.
Well, at least it's not just my one that does that ;-)
Now that I've found the "more echo cancellation" tickbox in the v3.x
firmware, I will wait and see whether that solves or reduces the
problem. I did have one PSTN call earlier, and it seemed OK, but then
the thing always seems a bit intermittent.
Jono schreef:
> TheFug formulated on Sunday :
>> So i guess you already overcome the problem of accessing the 3102
>> webinterface, i thought i had setup it correctly to do so, but i only
>> had access when the pc was straight plugged into the 3102, not both
>> via LAN :( what's the secret ?
>
> Follow the instructions here, if I've understood your question correctly.
>
> <http://www.provu.co.uk/support_SPA-3102_SPA-3000.html>
>
>
Yes, i also did that part, i guess i get still blocked by my router
itself ...
Martin Johnson schreef:
> Brian A wrote:
>
>> You asked in your original post about the Fritzbox.
>> I have one and I also have an SPA-3000.
>> I would say that the Fritzbox performs well and is much easier to get
>> up and running, for the average person, than the SPA-3000.
>> However, for me, I would have the SPA-3000 every time.
>> My prime reason for saying this is the ability to customise the
>> dialling experience via the dial plan. In its effort to be simple the
>> Fritzbox loses out in this area. I have hardly used my Fritzbox 7140
>> but I am considering selling it just for this reason - so any offers
>> by email greatfully received. Personally, I have experienced little
>> trouble with echo on either my
>> SPA-3000 or the two SPA-3102 that I have set up for others.
>> It is important to get the line impedance set correctly - then I just
>> tweak the gain, as appropriate, and switch on the echo cancelling
>> options.
>
> Thanks for that.
>
>> On a separate topic, not wishing to hijack the thread...
>> I remotely control one of the SPA-3102 so that I can sort out any
>> problems from home. I have found that it is impossible to get the web
>> 'Voice' control interface to come up correctly on a Windows XP Pro
>> platform using Firefox, Opera or MSIE 7.
>> The problem I get is that all the tab contents displayed under each
>> other, in one long list, and then the egg timer just hangs as if
>> waiting for more data. I have tried emptying the RAM and disk cache to
>> no avail. I am aware that this web interface uses javascript so there
>> may be some problem there though I don't think that is the problem.
>> In Ubuntu Linux it will display OK most of the time but sometimes the
>> page needs to be loaded again for a correct display.
>
> This has the sound of an MTU problem to me. I would monitor your
> network traffic with WireShark and watch what happens when it stalls.
> And/or, try temporarily reducing your client's MTU to something like
> 512. That's not a fix, but if it temporarily solves the problem, you
> can then examine the network to try to see what's causing it.
>
> Cheers,
>
> - Martin.
In article <jfjd2494fskclils1vu5dtqu3ocpvj73cf@4ax.com>,
Brian A <no_spam_bca1000@hotmail.com> writes:
> On a separate topic, not wishing to hijack the thread...
> I remotely control one of the SPA-3102 so that I can sort out any
> problems from home. I have found that it is impossible to get the web
> 'Voice' control interface to come up correctly on a Windows XP Pro
> platform using Firefox, Opera or MSIE 7.
> The problem I get is that all the tab contents displayed under each
> other, in one long list, and then the egg timer just hangs as if
> waiting for more data. I have tried emptying the RAM and disk cache to
> no avail. I am aware that this web interface uses javascript so there
> may be some problem there though I don't think that is the problem.
> In Ubuntu Linux it will display OK most of the time but sometimes the
> page needs to be loaded again for a correct display. So, I am tied to
> booting up in Ubuntu if I want to access the SPA-3102 remotely.
> Any ideas on this one?
It's a bug in the TCP stack in the Sipura's. It was
reported to Sipura years ago, but seemingly not fixed.
If the outstanding unacked data gets to 32kbyte, the Sipura
messes up it's calculations of where it's got to and starts
retransmitting already acked TCP data. (This is likely a
classic coding mistake, treating the window value as a signed
16 bit value rather than unsigned 16 bit or a 32 bit value.)
The remote end will give up and reset the TCP connection,
leaving you with a partly loaded web page, which causes the
tabs not to work (or in some browsers, no display at all).
This is most likely to happen when accessing the web pages
across a WAN (where there's a transit delay), and when
accessing the larger web pages (e.g. admin, advanced).
To workaround this, set the maximum TCP receive window on
your browser system to 16k, so that the Sipura can never
get to 32kbytes of unacked data outstanding. How you do
this will depend on your OS. If (as is normally the case)
the setting applies to all TCP connections, it may have an
adverse effect on TCP performance in some circumstancies.
--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]
On Sun, 11 May 2008 15:43:30 +0200, TheFug <nosp@mplea.ze> wrote:
>Brian A schreef:
>> On Sat, 10 May 2008 12:40:33 +0200, TheFug <nosp@mplea.ze> wrote:
>>
>>> Martin Johnson schreef:
>>>> Can anyone recommend an ATA with really good echo cancellation?
>>>>
>>>> My SPA-3000 has never crashed, but echo cancellation has always been a
>>>> bit poor (particularly at the remote caller's end), and dependent on
>>>> audio gain levels set in the poorly-documented, over-complex web GUI. A
>>>> while back I upgraded to the current V3 firmware, which hasn't really
>>>> helped. So I wondered whether a more modern ATA box would have better
>>>> echo cancellation.
>>>>
>>>> I only need 1*Ethernet port and 1xFXS port, as I have a London 8 PABX
>>>> that can be configured as 2+6. But an ATA with 1*Ethernet, 1*FXS, 1*FXO
>>>> would be more flexible, if slightly more complex.
>>>>
>>>> What do people reckon to the Cisco ATA 186? I'm used to configuring
>>>> Cisco routers and switches, and Cisco kit tends to be very reliable.
>>>> Seems to be around the UKP 112 mark.
>>>>
>>>> Also - any comments on the FRITZ!Box Fon ATA? Seems hard to find in the
>>>> UK (even from the websites listed on AVM's site as resellers). Has it
>>>> been discontinued?
>>>>
>>>> Thanks for any info!
>>>>
>>>> - Martin.
>>> The Germans use a annexB type of fritzbox, in holland there are several
>>> sites where you can order a Fritz!box 7170,(annexA) great thing, has
>>> much features, don't expect a pro GUI webinterface, it's meant for the
>>> layman, and is easy to set, and has some very advanced features,(USB
>>> port for storage, printer... and softswitch options) which are far more
>>> easier to set, then a cisco/linksys device.
>> You asked in your original post about the Fritzbox.
>> I have one and I also have an SPA-3000.
>> I would say that the Fritzbox performs well and is much easier to get
>> up and running, for the average person, than the SPA-3000.
>> However, for me, I would have the SPA-3000 every time.
>> My prime reason for saying this is the ability to customise the
>> dialling experience via the dial plan. In its effort to be simple the
>> Fritzbox loses out in this area. I have hardly used my Fritzbox 7140
>> but I am considering selling it just for this reason - so any offers
>> by email greatfully received.
>> Personally, I have experienced little trouble with echo on either my
>> SPA-3000 or the two SPA-3102 that I have set up for others.
>> It is important to get the line impedance set correctly - then I just
>> tweak the gain, as appropriate, and switch on the echo cancelling
>> options.
>>
>> On a separate topic, not wishing to hijack the thread...
>> I remotely control one of the SPA-3102 so that I can sort out any
>> problems from home. I have found that it is impossible to get the web
>> 'Voice' control interface to come up correctly on a Windows XP Pro
>> platform using Firefox, Opera or MSIE 7.
>> The problem I get is that all the tab contents displayed under each
>> other, in one long list, and then the egg timer just hangs as if
>> waiting for more data. I have tried emptying the RAM and disk cache to
>> no avail. I am aware that this web interface uses javascript so there
>> may be some problem there though I don't think that is the problem.
>> In Ubuntu Linux it will display OK most of the time but sometimes the
>> page needs to be loaded again for a correct display. So, I am tied to
>> booting up in Ubuntu if I want to access the SPA-3102 remotely.
>> Any ideas on this one?
>>
>>
>>
>> ---
>> Remove 'no_spam_' from email address.
>> ---
>
>So i guess you already overcome the problem of accessing the 3102
>webinterface, i thought i had setup it correctly to do so, but i only
>had access when the pc was straight plugged into the 3102, not both via
>LAN :( what's the secret ?
This is the way I do it.
1. Firstly you need to tackle the possible problem of a dynamic IP on
the source computer.If the IP changes then you won't know what IP to
link to.The Netgear router I am linking to has the facility to
register with dyndns.com. Set up an account on the web site. I used
'selfip' as a domain as the default one didn't seem to work properly.
If your router does not have this facility then you can put a program
on your computer to do a similar job. It will communicate with
dyndns.com and tell it what the current WAN IP is. This enables a
standard url to link to an IP which may be dynamic. Dyndns keeps track
of the WAN IP used by the source.
2. I changed the web port on the SPA-3102 to 81 and forwarded that
port, in the router, to the local 'ATA' IP of the SPA-3102.
>To workaround this, set the maximum TCP receive window on
>your browser system to 16k, so that the Sipura can never
>get to 32kbytes of unacked data outstanding. How you do
>this will depend on your OS. If (as is normally the case)
>the setting applies to all TCP connections, it may have an
>adverse effect on TCP performance in some circumstancies.
Well, Andrew, that does indeed solve the problem. Thank you for that.
I was able to use Firefox, Opera and MSIE 7. They all worked.
I guess that to change the TCP receive window settings it would mean
delving into the registry. If there is a way of doing it via some
windows utility then I don't know it, other than possibly regedit.
Instead I found a program called 'Tweakmaster' and did it via that. It
made a universal setting. I would have preferred to make a browser
only setting, if that had been possible, but I don't know how I can
easily do that. I have Firefox as my main browser but, if I could set
Opera for this use, then I would choose to do that. I checked out
'about:config' on Opera and Firefox but I couldn't locate any
appropriate customisable settings there, though I may not be looking
for the right things..
I don't know yet if there have been any noticable affects on general
performance.
ATA to replace SPA-3000? 
Linear Mode
