Matt Hess wrote:
I have echo cancellation on in the mp-108 as well as silence
suppression.. tinkering with these two settings has not yet yielded any
happy results.. which is why I'm asking if the asterisk system has any
possible echo cancellation that may help alleviate this issue as it's
not only seen on the mp-108 but a few sip phones as well such as a
budgetone 2 and an ipdialog.. I have a feeling this has to do with voice
output levels.. but it's just a hunch that adding a bit of a reduction
to the output audio on the pri trunks will help..
as I remember it.. if point A calls point B and point A hears echo and
point B does not then it's something like an impedance problem on the
far end.. or wire center (CO) at that point.. but an impedance mismatch
can occur also at a pstn ingress point such as the ILEC side of the pri
lines.. or maybe I'm wrong..
Steve Clark wrote:
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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Here is a pretty good write up on it.
http://www.infineon.com/cmc_upload/0/000/012/234/voip_sidec.pdf
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