From: Security Candidate (doubleccie@yahoo.com)
Date: Sat May 14 2005 - 01:49:13 GMT-3
Folks ;
I have a problem since few months and unfortunetaly it is not resolved even with the help of Cisco TAC , the problem is voip configuration with 3745 routers to be intergrated with NEC PBX to carry voice traffic as shown
PBX1--------------E1--------3475HQ------------ATM cloud----------------3745Site--------E1-----PBX2
PBX1--------------E1--------3475HQ------------ATM cloud----------------3745Site---------E1----PBX3
so the 3745 of the HQ is connected to the PBX1 with two E1 controllers , on the site there is another 3745 connected to Two separate PBX's PBX2 and PBX3
the PBX E1 cards are using properitery signalling , so the only option to do this configuration is to use TCCS signalling between the 3745 and the PBX's , with connection trunk configuration.
the problem
=========
with only one E1 link (PBX1 to PBX2) everything seems to work fine , when we connect the second link , both links start to show up strange voice issues like no ring back tones and some times both sides they cannot hear each other .
Cisco TAC has tried some many options starting from changing the IOS ending with different combinations of configuration ( such as chaning voice codecs ( clear channel or G711) ) and disabling VAD ...things like that ) but the problem remains .
it is important to highlight that PBX1 and the other two PBX's are also having direct links connecting them ...so not just the VOIP links .
I wish there is someone here who is expert in PBX who can tell what to do to make sure that the PBX is not really the issue , because i start doubt that the problem may be is PBX issue and not really from the routers .
thanks
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