[cisco-voip] Modem Passthrough: Clocking Issue

[Ramiz Sardar]

Friends,

I am working on voip setup where i am trying to configure modem passthrough
but i am encountering slips issue. My topology you can see below:

RAS----PBX1----Router1--------Router2-----PBX2-----Dialup User

Note: RAS is connected with PBX1 via PRI, PBXs with routers(c3800) via E1
PRI (Qsig). Routers are connected back-to-back via E1. All devices are in
same testing lab.

when dialup user try tot connect with RAS, modem keeps negotiating and not
gets connected. Something it gets connected but after a while gets
disconnect.
I diagnose the problem, that is not because wrong configuration but it is
due to clocking missmatch between Routers and PBXs. Thats why when i run
command "show controller e1 0/0/0", i find slips there.
Please someone suggest me how to get this issue resolved. And also tell me
the best prectice regarding clocking for the topology above.

Waiting For your positive immediate response.....

Best Regards

Rameez
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