5300 DSP usage

[gavin.davis]

Can anyone confirm the following as I need to spec a VOIP network:

Consider an E1 connected to the PSTN from a 5300 VOIP enabled router.

(30 channel card)

Another E1 is connected to a Local PABX.

If a call comes from the PSTN and is redirected to the PABX via the POTS command,how many DSP 's are used?

Is it one DSP for the incoming call to the router and one to the PABX ie 2 DSP's or is it just a total of one DSP for the redirected call?

Tahnks

[bbaley]

It says at http://www.cisco.com/univercd/cc/td/doc/product/access/acs_serv/5300/hw_inst/mod_inst/53mvopv2.htm#xtocid210355 to use 5 modules for E1 applications. How many actual DSP's are used in your scenario, I don't know. Maybe the "IP Telephony Solution Reference Network Document (SRND)" at http://www.cisco.com/warp/public/779/largeent/netpro/avvid/srnd.html can help with the specifics.

[gavin.davis]

Thanks , however unfortunately this documentatin does not answer the question, which I will try to re-phase for another guru out there who may know .

How many of the 30 DSP resources does a call coming from an E1 channel through to a PABX on another E1 channel on a 5300 VOIP router with a low density VFC card. IS it one or 2, when G711 is obviuosly used?