Unanswered Question
Aug 27th, 2007
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i have 2811 with PVDM2-16 and 4 ports FXO, so each port will take a channel from PVDM2-16, the remaining is PVDM2-12, I want to do HW conference resource using these PVDM2-12, is it possible to do this, since I get that not enough DSP resources when trying to create conf profile?

is it a limitation so that i can not share between termination for fxo ports and conf resource in the same PVDM2-xx module? or something else?

appreciate kind helps?


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DRAGI RADOVANOVIC Mon, 08/27/2007 - 09:53
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You will need a separate DSP for that, since the conferencing cannot share DSPs.


user-cisco Mon, 08/27/2007 - 10:40
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thanks Dragi for ur response

so i will have PVDM2-12 channels not used !

then if i have 2 PVDM2-8 modules, and I want fxo 4 ports to consume PVDM2-4 from module 1, then i thnk i can make conf resource from the second PVDM2-8 module? right?

Stoyan Stoitsev Tue, 08/28/2007 - 00:24
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PVDMs have different DSP counts. PVDM2-16 has one DSP, PVDM2-32 has 2 DSPs and so on. If you wan to do hardware conferencing with DSPs you must dedicate at least one DSP for that (note the difference between a DSP and a PVDM!) or more depending the number of conferences you need to support.

In your case you should put the PVDM2-8 on PVDM slot 0 so it will be used by the FXO ports and the PVDM2-16 on slot 1 (these slots are on the PCB of the router).

The lowest PVDM I recommend you to use for conferencing is PVDM2-16 since PVDM2-8 is a low cost one DSP module and is not fully functional as the PVDM2-16.



user-cisco Tue, 08/28/2007 - 02:09
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thanks Stoyan for ur really helpful answer,

but note that i have just only pvdm2-16 card being put in slot0, then i got from ur answer it is not possible to do conf using hw resource (conf profile) with this same pvdm2-16 card keeping in mind that fxo will use 4 channels?

user-cisco Tue, 08/28/2007 - 03:26
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thanks sstoitsev

is this same case valid for HW conference resource for MoH or not?

i mean i want to utilize the existing pvdm2-16 as HW dsp resource fro MoH can i accomplish this? how?

or is it needed to have a seperate PVDM2-xx also?

thanks again

appreciate ur help

Stoyan Stoitsev Tue, 08/28/2007 - 07:56
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Here is a doc about that

"Cisco CallManager and Cisco IOS Interoperability Guide"


Although I can't quite understand what exactly you're trying to achieve. MoH can be streamed with 711 and 729 codecs and this is configured from the service parameters.

user-cisco Tue, 08/28/2007 - 08:35
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MoH needs either HW resources or SW resources, what i meant is that i have 2811 with pvdm2-16 and 4 ports fxo, can i utilize this pvdm2-16 module for both fxo termination and as HW resource for MoH?


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