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Transcoding 2901

Frequent Contributor
Frequent Contributor


I have a 2901 with 1 x PVDM3-32 and 1x PVDM3-64

The only interface card that uses the DSP's is a VWIC2-2MFT-T1/E1

I want to add a transcoder using the LTE interface, I think I should have enough DSP's, but max sessions says <0-0>

As far as I can see the PVDM3-32 should be free for transcoding services


Any idea why I have no transcoding sessions?



7 Replies 7

Chris Deren
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Can you post "show run" and "show diag"?

Frequent Contributor
Frequent Contributor

Hello Chris


Attached the config, I have removed some config like dial-peers and sip-ua config



Since you have 2 E1-PRIs the 64+32 channel PVDMs with flex complexity all may be allocated to your PRIs, I suggest you read the following great write up on DSP credits to confirm if that is the case:



As an additional resource, this excellent explanation from Vik:

Very good video, thanks for posting Anthony.

Frequent Contributor
Frequent Contributor

I did an IOS upgrade and suddenly I have max sessions 23.

The IOS was quite old for this 2901

I saw that the DSPWARE VERSION went from 20 something to 46.2.12


Thank you all for the advice and links

very good, thinking about it the single PVDM3-64 should have covered your 2 E1s, so this makes sense now.

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