[Asterisk-Users] sip call echo cancellation

[Steve Clark]

Matt Hess wrote:
> I haven't found much info that stands out to me in regards to echo 
> cancellation in sip to sip calls..
> 
> My setup is this..
> I have a key system connection to an audiocodes mp-108 which connects to 
> asterisk via sip and asterisk passes the call over to a ser proxy and 
> ser passes the call to either an internet voice terminator for long 
> distance or a local pstn gateway.. the local gateway is a lucent max tnt 
> with 10.1.1 software load.. it dumps the sip calls onto pri trunks..
> 
> I'm still getting feedback from the office as to whether or not echo is 
> heard on local or long distance.. incoming outgoing etc.. so I know 
> which part to troubleshoot.. if the echo is on egress or ingress.. I 
> know it isn't the local key system with echo as it's almost all digital 
> apart from the analog connection from key system to audiocodes sip 
> gateway as I also have a few ip phones which connect to asterisk that 
> experience similar echo issues.. remote callers don't seem to hear any 
> echo so it would appear to be an impedance issue somewhere remotely on 
> the pstn..
> 
> My thinking is that the mismatch may be on the local tnt gateway but I'm 
> not 100% positive of that.. I know ingress calls to the sip network have 
> echo and those flow through the pri lines to the tnt so I'm starting 
> there with that gateway but I'm looking for something possibly on 
> asterisk that can help with pure sip call echo cancellation.. does 
> anyone have any ideas as to what may help?
> 
> 
> 
> 
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In the MP-108 try turning on Silence Suppression and Echo Cancellation.

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