Re: SPA3102 PSTN Audio quality

Hi Jono,

> I'm using an SPA3102 in conjunction with a GSM premicell. When dialling
> out over the mobile network, although I can hear the caller perfectly
> well, they experience clipping of the audio at their end.

In the webinterface of the SPA, under the tab "regional", you can find a
setting "FXS port input gain". If you set this at a lower level, this should
decrease the audio level towards your premicell. Try it with steps of 3 (dB)
at a time. A good start value is -3 (that is what I believe is the default).
Negative values mean a reduction, positive values mean amplification of the
audio signal.

Oh... if you don't hear any difference at all, then this is my fault: I
always seem to confuse FXO/FXS input and output signals. If I screwed up:
you need to do the described procedure with the "FXS port output gain" :-)

Hope this helps...
Christian

> I'm using an SPA3102 in conjunction with a GSM premicell. When
> dialling out over the mobile network, although I can hear the caller
> perfectly well, they experience clipping of the audio at their end.

You know what: I screwed up already :-) Never mind my earlier post, you
need to adapt the audio level from the SPA towards your PSTN line (the
premicell). The recommendation I made in the previous post would work but
would also affect the audio-levels on your VOIP-calls.

So... second attempt: in the webinterface of the SPA, under the tab "PSTN
line", you can find a setting "SPA To PSTN Gain" (at the bottom of the
page). If you set this at a lower level, this should decrease the audio
level towards your premicell. Try it with steps of 3 (dB) at a time. A good
start value is 0 (that is what I believe is the default). Negative values
mean a reduction, positive values mean amplification of the audio signal
towards the PSTN-line.

Hope I really helped you this time :-)
Christian