[c-nsp] 2821 voice configuration

[Brian Turnbow]

The vwic-2 cards can do voip or cross connect (no dsp used) but a channel can not do both at the same time.
It is done on the controller creating a ds0 group or tdm group. In one E1 you can have both but the channels are dedicated.
At least AFAIK. 
With 2 pvdm-32s you can do 64 channels of g711 , but any other codecs, fax/modem relay will be a medium or high complexity codec and will lower your channels considerably.

Brian



-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Brett Looney
Sent: giovedì 13 novembre 2008 3.52
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] 2821 voice configuration

> 95% of the calls should be G.711, so that leaves me with 64 channels.
> So in theory I should be able to fully utilize both E1s with calls
> originating from SIP, right? What about E1-to-E1 calls that are just
> switched in the box? Do they take any DSP resources at all?

I'm unsure on that - best to check with Cisco. My guess is that they do take
DSP resources and you'll be looking at two per call - one for the "incoming"
E1 call leg and one for the "outgoing" E1 call leg. I could be wrong though
- I would budget for worst-case in any event.

B.

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