[cisco-voip] Calculating DSPs for converting SIP trunks to PRIs

[Mark Holloway]

PVDM2 modules signify 1:1 correspondence with G.711.  Two PVDM2-48 modules
will provide 96 call paths to your PBX.  Note that ISDN PRI uses 23B
channels and one D channel per PRI unless you are using NFAS.  23x4=92

Using a SIP trunk has no influence on PVDM2 resource allocation.  The point
of reference is the number of B channels used on the VWIC modules.



On 5/12/09 3:25 PM, "Justin Shore" <justin at justinshore.com> wrote:

> Greetings.  I've been unable to figure out how to calculate the DSPs
> needed on a 2800 to terminate a SIP trunk and hand off PRIs.  We're
> going to be handing off 96 active lines to a customer on 4 PRIs.  The
> calls will all be G.711.  The DSP Calculator didn't seem to cover SIP
> trunking.  Suggestions?
> 
> Thanks
>   Justin
> 
> 
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