[asterisk-users] Inhouse SIP to ZAP has echo sometimes.

[Ejay Hire]

Hello.
 
I had the same problem, and was able to fix it as follows.
 
1.  Run fxotune
2.  Call your XO rep and get a milliwatt test line number
3.  set the gain in the zaptel.conf incoming with the milliwatt test line
4.  loop a call through the pbx and set the outgoing gain.
 
With these setup properly, the echo problem goes away.
 
-Ejay

  _____  

From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of BerkHolz,
Steven
Sent: Friday, October 13, 2006 12:51 PM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] Inhouse SIP to ZAP has echo sometimes.


Sometimes we get echo heard on SIP phone when dialing out.
 
Zap channel is on a TE411 Card.
It is using a PRI to XO.
 
As far as I know echo is created on the far side.
Could the Zaptel card be the far side as far as the SIP phone is concerned?
 
Calls from our soon to retire legacy PBX do not have this problem.
Those calls are Legacy - PRI - asterisk -PRI - XO - Dest.
 
 
Any suggestions?
 
 
 
 
 
 
Zaptel.conf:
 
context=from-pstn
switchtype=national
pridialplan=unknown 
prilocaldialplan=unknown
priindication=inband
signalling=pri_cpe
usecallerid=yes
hidecallerid=no
usecallingpres=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
group=0
callgroup=1
pickupgroup=1
useincomingcalleridonzaptransfer=yes
callerid=asreceived
accountcode=I
musiconhold=default
overlapdial=no
facilityenable=yes
nsf=none
channel => 1-23
 
I also set "static int vpmdtmfsupport = 0;" in wct4xxp.c to remove sporotic
DTMF tones.
 
 
 
 
 

 

Thank You,

Steven BerkHolz
- MCSA - MCSE -
Manager of Information Systems
TESCO Group Companies
Fax. 248-836-5101
www.TESCOGroup.com

Board member of
www.glimasoutheast.org

 
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