Is a 1 port serial WAN interface card (WIC-1T) compatible with a 3725 multiservice router? The router currently has a T1 CSU/DSU WAN interface card (WIC-1DSU-T1) card but I cannot use it because CSU/DSU uses a V.35 connection.
the thing is that the 3725 is not really multiservice ready, you need a voice module like nm-hvd-xxx, and can be expensive, but if you was to terminate voice on a 2801 with vwic-1t1, you could connect it via thernet to the 3725, and use all 16 channels for data, you would send compressed voice via voip.
This if I didn understand the problem correctly, else send a little diagrama of how things are connected today and how you would like to do things for change.
The Cisco T1 DSU/CSU WAN interface card is an integrated, fully managed Data Service Unit/Channel Service Unit (DSU/CSU) for T1 or fractional T1 service, i am unaware of any implementations of this card with a PBX system, and i don't think that it supports voice at all.
NOTE: that to use it you'll need Cisco IOS Software Release 12.2(13)T, 12.2(11)YT and later.
Please do check this document for more details:
HTH, please do rate all helpful replies,
You can't. The WIC-1DSU-T1 doesn't support voice.
If you tell us which type of interface your PBX has, we can suggest an appropriate module to connect to the 3725.