SV: [Asterisk-Users] re: Sound issues on SIP-SIP calls

[Rich Adamson]

The echo statements in zapata.conf apply "only" to zap channels; nothing 
at all to do with sip channels.

The echotraining=800 statement essentially sends a pulse 800 
milliseconds after a pstn line has been grabbed by asterisk, and 
measures the reflected energy. That value is used to preload the echo 
canceller (on zap pstn calls) allowing the echo canceller to train quicker.


steve wrote:
> I thought the same thing before I made my reply but zapata.conf seems to 
> be the
> only config file that deals with echo at all. From what I understand of 
> 'echotrain'
> is that at the beginning of the call it sends a short signal out that 
> measure echo
> in an attempt to try and cancel it. I was wondering if you tried using 
> it and if so was it of any help?
> 
> Sincerely,
> Steve
> 
> But is Zapata.conf even in the picture when all calls go through a
> SIP-provider, since the calls are not being routed through a ZAP channel?
> 
> Regards,
> Bjorn
> -----Opprinnelig melding-----
> Fra: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] På vegne av steve
> Sendt: 22. mars 2006 23:11
> Til: asterisk-users at lists.digium.com
> Emne: [Asterisk-Users] re: Sound issues on SIP-SIP calls
> 
> When you hear echo its actually being caused by the other phone. check 
> your zapata.conf file and see if echotraining=yes.
> Echo can be caused by lots of things so this is just a starting point.
> 
> For several months now we’ve been experiencing a really strange problem 
> with
> sound which best can be explained as choppy/stuttery, and with a touch of
> echo on top. Basically, parts of a conversation might be choppy, but often
> combined with some echo as well. The sound problem can only be heard by us,
> not by the other party. But this is the strange part:
> 
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