From: Frank Jimenez \(franjime\) (franjime@cisco.com)
Date: Wed May 18 2005 - 23:39:40 GMT-3
Sorry for the late reply on this - I just saw the message.
There are some proprietary PBX protocols that are so timing dependant that
they can't withstand the codec conversion process without causing line
slips, this makes them unlikely candidates for TCCS. You might want to take
a look at the Circuit Emulation-over-IP (CEoIP) modules that Cisco
introduced last year - these cards do a bitwise translation of the T1
circuit into the packet network.
Take a peek at:
http://www.cisco.com/warp/public/cc/pd/rt/ps282/prodlit/ceoip_ds.pdf
Good Luck!
Frank Jimenez, CCIE #5738
Systems Engineer
Cisco Systems, Inc.
franjime@cisco.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Security Candidate
Sent: Friday, May 13, 2005 11:49 PM
To: ccielab@groupstudy.com; security@groupstudy.com
Subject: Expert TCCS /PBX question
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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