You will also perceive jitter as echo
If any links are getting busy and routers or switches have to buffer
you will hear what sounds like echo, not to mention if you have a
high packet loss also
Of course jitter would have to be above 100ms or so to be noticeable
as far as acoustic echo, i have had to put 192ms tail ec on pri
direct from carrier because of so many networks interconnecting and
doing poor jobs and that 192ms is not going to be enough shortly
yes traditionally telco echo originated at 2wire to 4 wire transition
points or on hybrids hence it is usually referred to as hybrid echo
versus acoustic echo which does happen in an all digital call. This
is one thing the better quality phones give you some control of.
I am starting to look at dedicated aec hardware to handle even all IP
calls
On Oct 26, 2006, at 9:56 PM, Michael Araba wrote:
I am surprised that you are getting echo on SIP calls. You can get
echo
in two scenarios on SIP calls.
1. If SIP calls are crossing to PSTN (inbound/outbound). Here you need
to enable echo canceller and AGGRESSIVE if needed in zconfig.h.
2. Second source of echo on SIP calls could be ACOUSTIC. The phone
sets
you are using may not handle this well.
In my experience sound quality deteriorates if there is network
trouble
or congestion on SIP calls
I hope this helps.
Michael
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