I have BTFon which allows me WiFi connections when travelling. I can make
VOIP calls through my laptop but it is all so involved. Is there a mobile or
I-Phone I can use in WiFi mode free or very cheap and still use the cellular
route is there is no WiFi available?
Meanwhile, at the uk.telecom.voip Job Justification Hearings, Peter Turtill
chose the tried and tested strategy of:
> I have BTFon which allows me WiFi connections when travelling. I can make
> VOIP calls through my laptop but it is all so involved. Is there a mobile
> or I-Phone I can use in WiFi mode free or very cheap
There are many, many phones that have Wifi and the ability to install a
softphone. Ones I have used are Nokia E61 and E63.
> and still use the cellular route is there is no WiFi available?
Don't bet on it. Mobile data doesn't seem to lend itself to VoIP due to the
high latency and jitter. I don't know if this is feature of UMTS or
operators in the UK oversubscribing their networks.
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<http://ale.cx/> (AIM:troffasky) (UnSoEsNpEaTm@ale.cx)
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"I am utterly appalled at how I have been treated like a criminal"
-- Andrew Crossley, ACS:Law, 13 August 2010
alexd <troffasky@hotmail.com> wrote:
> Meanwhile, at the uk.telecom.voip Job Justification Hearings, Peter Turtill
> chose the tried and tested strategy of:
>
> > and still use the cellular route is there is no WiFi available?
>
> Don't bet on it. Mobile data doesn't seem to lend itself to VoIP due to the
> high latency and jitter. I don't know if this is feature of UMTS or
> operators in the UK oversubscribing their networks.
If you have 3G IME it's just about OK. If you're on EDGE or GPRS I'd give
up. Note that some networks might deliberately inject jitter to block VOIP,
so it might vary from network to network.
Theo Markettos <theom+news@chiark.greenend.org.uk> wrote:
> If you have 3G IME it's just about OK. If you're on EDGE or GPRS I'd give
> up. Note that some networks might deliberately inject jitter to block VOIP,
> so it might vary from network to network.
Another thing to add, if you meant using the cellular network for voice
calls in the backup situation, rather than calls over VOIP. Quite a few
softphones integrate with the phone's dialler: SIPDroid, for example, pops
up a menu when you dial in the normal Android dialler asking if you want to
make a GSM phone call or a SIP call.
Another trick is to use GSM data to initiate a call by getting a website to
ring you back. A lot of Betamax operators will do that, or you can set up a
ringback system yourself without a data connection (ring number, claims to
be engaged, hang up, system calls you back, then you enter the destination
number). These use cheap VOIP routes to your mobile (eg Voipgain
2.5p+VAT/min) rather than mobile network charges.
"alexd" <troffasky@hotmail.com> wrote in message
news:1924750.DPOM1BCLMh@ale.cx...
> Meanwhile, at the uk.telecom.voip Job Justification Hearings, Peter
> Turtill
> chose the tried and tested strategy of:
>
>> I have BTFon which allows me WiFi connections when travelling. I can make
>> VOIP calls through my laptop but it is all so involved. Is there a mobile
>> or I-Phone I can use in WiFi mode free or very cheap
>
> There are many, many phones that have Wifi and the ability to install a
> softphone. Ones I have used are Nokia E61 and E63.
It is actually built in on many Nokia phones, including my N79, and works
well over wi-fi.
>
>> and still use the cellular route is there is no WiFi available?
It also "accidentally" uses 3G if it is available. Voice quality is poor
(jumpy mostly) and in theory this is a breach of my SP's T&C.
>
> Don't bet on it. Mobile data doesn't seem to lend itself to VoIP due to
> the
> high latency and jitter. I don't know if this is feature of UMTS or
> operators in the UK oversubscribing their networks.
Bandwidth is prioritised for voice to ensure a steady throughput and
reliable quality.
Non voice data on the other hand is sent in big lumps. This is ideal for
surfing, and fine for music or video (where the user device buffers ahead),
but not very good for telephony, where speech can't be sent until it is
spoken.
It will be a "feature" of trying to do voice telephony over any statistical
network.
Meanwhile, at the uk.telecom.voip Job Justification Hearings, R. Mark
Clayton chose the tried and tested strategy of:
> It is actually built in on many Nokia phones, including my N79, and works
> well over wi-fi.
....
> It also "accidentally" uses 3G if it is available. Voice quality is poor
> (jumpy mostly) and in theory this is a breach of my SP's T&C.
My E61 registered fine on 3G, but the E63 took some persuading. Even once
registered over 3G, any attempt to call it results in a 486 Busy Here. Wifi
is fine.
I don't know if this is bug on the E63, a feature on the E63 or interference
from Vodafone. I suppose I should tether my laptop to it and test with a
more fully-featured SIP client.
>> Don't bet on it. Mobile data doesn't seem to lend itself to VoIP due to
>> the
>> high latency and jitter. I don't know if this is feature of UMTS or
>> operators in the UK oversubscribing their networks.
> It will be a "feature" of trying to do voice telephony over any
^^^
> statistical network.
Not in my experience. SIP client on my phone over 3G was unusably bad. Over
wifi+broadband it's fine; I use an IP handset at work all day long, which
connects to the PBX over a broadband connection [or two if you count my end
as well]. My Sipgate line over broadband is my phone line at home too.
--
<http://ale.cx/> (AIM:troffasky) (UnSoEsNpEaTm@ale.cx)
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"I am utterly appalled at how I have been treated like a criminal"
-- Andrew Crossley, ACS:Law, 13 August 2010
"alexd" <troffasky@hotmail.com> wrote in message
news:5489707.pKt5sWSEgd@ale.cx...
> Meanwhile, at the uk.telecom.voip Job Justification Hearings, R. Mark
> Clayton chose the tried and tested strategy of:
>
>
>> It is actually built in on many Nokia phones, including my N79, and works
>> well over wi-fi.
>
>
SNIP
>
>>> Don't bet on it. Mobile data doesn't seem to lend itself to VoIP due to
>>> the
>>> high latency and jitter. I don't know if this is feature of UMTS or
>>> operators in the UK oversubscribing their networks.
>
>> It will be a "feature" of trying to do voice telephony over any
> ^^^
>> statistical network.
>
> Not in my experience. SIP client on my phone over 3G was unusably bad.
> Over
> wifi+broadband it's fine; I use an IP handset at work all day long, which
> connects to the PBX over a broadband connection [or two if you count my
> end
> as well]. My Sipgate line over broadband is my phone line at home too.
Slightly inaccurate. Your broadband connection has large and probably
uncontested bandwidth uplink and massive (compared with 64kbps) bandwidth
downlink.
You will start to notice hiccups etc. if you run Voip over a busy shared
office ADSL connection, although I suspect BT prioritse tehir own VOIP even
on the local connection (to their hub)..
OTOH 3G is normally heavily contended almost all the time.
R. Mark Clayton wrote:
>
> Slightly inaccurate. Your broadband connection has large and probably
> uncontested bandwidth uplink and massive (compared with 64kbps) bandwidth
> downlink.
Broadband tends only to be uncontended over the local loop. Even then,
if you run a large file download, that will contend.
Meanwhile, at the uk.telecom.voip Job Justification Hearings, R. Mark
Clayton chose the tried and tested strategy of:
> OTOH 3G is normally heavily contended almost all the time.
Right. Which is what I was asking upthread; is the latency a feature of
UMTS, or the way it's implemented.
--
<http://ale.cx/> (AIM:troffasky) (UnSoEsNpEaTm@ale.cx)
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"I am utterly appalled at how I have been treated like a criminal"
-- Andrew Crossley, ACS:Law, 13 August 2010
----- Original Message -----
From: "alexd" <troffasky@hotmail.com>
Newsgroups: uk.telecom.voip
Sent: Sunday, December 05, 2010 12:06 PM
Subject: Re: Viop mobile
> Meanwhile, at the uk.telecom.voip Job Justification Hearings, R. Mark
> Clayton chose the tried and tested strategy of:
>
>> OTOH 3G is normally heavily contended almost all the time.
>
> Right. Which is what I was asking upthread; is the latency a feature of
> UMTS, or the way it's implemented.
'
It will be a "feature" of trying to do voice telephony over any statistical
network.
'
Where there is little or no contention or voice traffic is prioritised then
it will work OK. Where the network suffers any contention and voice is
mixed in general traffic (which is what happens if you use Skype) then you
will experience poor quality.
So it is an inherent feature of UMTS if you use data transfer for voice.
Actual voice connections are not affected because they go first and only use
relatively little bandwidth.
>
> --
> <http://ale.cx/> (AIM:troffasky) (UnSoEsNpEaTm@ale.cx)
> 12:04:03 up 9 days, 17:24, 6 users, load average: 0.07, 0.02, 0.02
> "I am utterly appalled at how I have been treated like a criminal"
> -- Andrew Crossley, ACS:Law, 13 August 2010
>
> It will be a "feature" of trying to do voice telephony over any statistical
> network. Where there is little or no contention or voice traffic is
> prioritised then it will work OK.
The 3G networks are unlikely to see it as being in their interest to
favour VoIP traffic ...
Viop mobile 
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