rxgain and txgain are used, for example with the X100P. As I understand it, the echo problem with a SIP to PSTN implementation in * has two components:
- echo resulting from the digital to analogue conversion at the X100P - acoustic feedback within the handset used
The former is reduced by using the zaptel echo canceller set by this in zapata.conf:
echocancel=yes echocancelwhenbridged=yes
The choice of echo canceller to use is made when you compile zaptel. mec2 is the default. You can enable aggressive cancellation in mec2 but this can be a bit too severe making calls sound almost half duplex. Mec3 seems to be a bit unstable.
You can reduce feedback related echo by tuning rxgain and/or txgain. A value of -3.0 will set the gain at about 70% of its initial value.
Iain
--On Wednesday, July 2, 2003 3:40 am -0700 "Ing. Angel Gomez Garcia" <[EMAIL PROTECTED]> wrote:
I have a SIP FXO 8 port VoIP gateway, and it has a parameter called 'input gain' wich is the one I modified, there might be a similar parameter on the configuration for the hardware you are using.
Dan wrote:
Hi,
What do you mean by pstn-gateway? There is no "input gain" parameter in zapata.conf file? It is about "rxgain"?
BR, Dan
----- Original Message ----- From: "Ing. Angel Gomez Garcia" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, July 02, 2003 11:48 AM Subject: Re: [Asterisk-Users] Problem with echo
I had a similar problem and solved it changing the params of "input gain" on my pstn-gateway, change from a value of 10 to a value of 1 and that eliminated the echo on the SIP Phones.
Dave Packham wrote:
Same prob here. 15 SIP phones only get eco when going to the PSTN...
if you find something let me know
Dave
Hello,[EMAIL PROTECTED] 7/1/2003 8:53:13 AM >>>
I can't have asterisk working without echo when I place a call from IP
phone (SIP or H323) to a PSTN Phone. The called number as no problem with echo but there is a very audible echo in the SIP phone. This situation occurs either when connected with ISDN card thru i4linux driver and with my openline card from voicetronix.
Do you have any suggestion fo that?
Regards,
Daniel ANDRE
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