You will need DSP resources if you want to support conferencing, transcoding, or media termination on the 2811. A PVDM provides DSP resources. You can use the DSP calculator below to determine the DSP resources necessary based on the network modules you will be using (FXS, FXO, T1/E1, etc) as well as your need for other services (conferencing, transcoding, etc). The PVDM link below describes the different PVDMs and the DSP resources they contain.
Any time you interface a TDM interface to the router to convert TDM signals to packets and back you need DSP resources. If you connect to a PBX or Telco and then convert those analog/digital signals to packet and back, will require a DSP. A t1, e1 , fxs, fxo interface on the router will utilize a DSP resource to do this conversion.
I was wondering about this myself. You said you need a DSP to convert to carry over a T1. I assume you only meant a PRI. Since it is already IP and if you go to a WAN interface I am thinking you don't need a DSP.
Well, for PSTN connectivity such as T1-PRI you will need PVDMs as it is conversion between IP to TDM (Gateway). If all you have is WAN connectivity between sites then you will not need PVDM, however unless you have SIP trunks integrating you with outside world you have PSTN Gateway connectivity somewhere.
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