[asterisk-users] Help! Echo problem even at T1 PRI?
Hello, We have an asterisk setup at our client's site using a TE205P. The line to telco is a 23 channels T1 PRI, however the line has random echo problems (about 5-10% of the calls)! Can anybody tell me if echo cancellation is really needed even at a T1 PRI to the telco? Because people keep saying when they deploy voip solution in Hong Kong using T1 PRI, there is no need of echo cancellation. (even the local Digium distributor) Asterisk is 1.2.13, zaptel is 1.2.10. I choosed the MARK2 canceller in the zaptel. The setting in zaptel is default: echocancel=yes echocancelwhenbridged=yes echotraining=yes rxgain=0 txgain=0 When I tried to adjust the echocancel value to a higher taps (e.g. 256) or adjust the rxgain/txgain value, I can even hear echo much easier. Anyone can confirm with me we should rather turn echocancelwhenbridged=no, or even echocancel=no when we only use a T1 PRI at the zaptel? Or can have other suggestions to try solving this problem? Because of some people's information that T1 PRI does not need any echo cancellation, add a hardware echo cancellation module is not an option here. I think I need some sort of information from another 3rd party before my boss will even agree to just try something out. Really thank you!! Vincent ___ --Bandwidth and Colocation provided by Easynews.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Cannot hear ringback music from telco
Hi Trevor,
Thanks for your suggestion, it works by adding a Answer() in between!
However it will make everycall in the CDR become Answered.
Later on I found that setting progressinband=no in sip.conf finally fixed
this problem!
Best Regards,
Vincent
Message: 12
Date: Thu, 01 Mar 2007 06:36:43 -0800
From: Trevor Peirce [EMAIL PROTECTED]
Subject: Re: [asterisk-users] Cannot hear ringback music from telco
To: Asterisk Users Mailing List - Non-Commercial Discussion
asterisk-users@lists.digium.com
Message-ID: [EMAIL PROTECTED]
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Vincent Tam wrote:
Hello,
We have an asterisk 1.2.13 box that use a Digium TE205P T1 PRI connect
to the telco, users mainly use snom 320/300 SIP phones.
When dialing to an external phone number with custom ringback music,
users reported that they could not hear the music but can only hear
the standard ring tone generated by the system.
Is there any kind of settings need to allow the ringback music pass to
the phone? We only use this simple dialplan to make outgoing call:
exten = _9.,1,Set(CALLERID(all)=$ {CIDPREFIX}${CALLERIDNUM})
exten = _9.,n,Dial(Zap/g0/${EXTEN:1}||T)
Try adding an Answer between those two, just to see who is producing the
ringing. If you do NOT hear ringing but DO hear music, it's an asterisk
or snom problem. If you still hear ringing, it's your PRI.
Might also want to check in to the phone's manual to see if there's a
setting to enable early-audio.
Trevor
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[asterisk-users] Cannot hear ringback music from telco
Hello,
We have an asterisk 1.2.13 box that use a Digium TE205P T1 PRI connect to
the telco, users mainly use snom 320/300 SIP phones.
When dialing to an external phone number with custom ringback music, users
reported that they could not hear the music but can only hear the standard
ring tone generated by the system.
Is there any kind of settings need to allow the ringback music pass to the
phone? We only use this simple dialplan to make outgoing call:
exten = _9.,1,Set(CALLERID(all)=${CIDPREFIX}${CALLERIDNUM})
exten = _9.,n,Dial(Zap/g0/${EXTEN:1}||T)
* CIDPREFIX is the 5 digit prefix of the company's PRI line, CALLERIDNUM
are 3 digit internal numbers
Thanks!
Vincent
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