[cisco-voip] Modem PassThrough

[Ramiz Sardar]

Friends,

I am currently working on voip setup. With the existing tdm network, dialup
users from different sites dial Remote Access Server in central site. When i
will put routers into that network, can users be able to connect again via
voip setup. Topology includes cisco 3800 routers that connect with Ericson
MD110 pbx through E1 (Pri Qsig). Routers are connected point to point
through E1. RAS is non-cisco.

Existing Topology:

IP Network
---------RAS------------PBX--------------------------------------------PBX--------------Dialup
User (Modem)

Topology after voip setup:

IP Network
---------RAS------------PBX---------Router-----------------------------Router--------PBX--------------Dialup
User (Modem)

With some study i come to know that there is concept of modem passthrough
that can be used but someone please explain it briefly. And if someone
currently using it, please write down a sample configuration according to my
voip topology.

Best Regards
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