Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 
New Member

Do I need a PVDM for my 2801 Router?

I have an existing HP Procurve network. We recently acquired a branch off that has a 2801 and a VWIC2 T1 module. The HP routers only need a T1 card. Our PBX is at the main office and rides on its on VLAN. Do I need a PVDM card in the 2801 at this new office to carry that same voice data or will it work fine as it it?


Re: Do I need a PVDM for my 2801 Router?

You'll only need PVDMs if you'll be transcoding between digital and analog on the router itself (e.g. jumping out to the PSTN or voice mail is on the router).

Hope that helps.

Re: Do I need a PVDM for my 2801 Router?

If you are configuring a PRI/CAS circuit between the gateway and the PBX, you need DSPs.

If the PBX just needs a data T1 to send it's VoIP over, then you don't need DSPs.

The question is - will you be CREATING RTP packets on your router. If your router is responsible for actually creating RTP packets, you need DSPs.

If the PBX is creating the RTP and sending to this router with a data connection, you do not need DSPs.



CreatePlease to create content