DSP resource

Normally we refer one DSP as PVDM2-16 which has 16 channel. So PVDM2-64 have four DSPs onboard.

Trancode can share DSP with voice channel. Conference will use dedicated/whole DSP even you just need fewer session.

1. One DSP has 240 flex credits.
2. Low complexity voice or transcoder uses 15 credits. This is for G.711.
3. Medium complexity voice or transcoder uses 30 credits. This is for G.729a.
4. High complexity voice or transcoder uses 40 credits. This is for G.729.


Here we can calculator how many transcoders one DSP can support.
1. 6 sessions for G.729
2. 8 sessions for G.729a.
3. 2 session for conference with 8 conferees each for G.729/G.729a. Total 16 conferees.
4. 8 session for conference with 8 conferees each for G.711. Total 64 conferees.
5. 16 G.711 voice channels.
6. 8 G.729a voice channels.
7. 6 G.729 voice channels.

Another thing interesting is:
1. For remote branch, PSTN comes in and send to Unity which is G.729a and use 30 credits. Then the call will be forward to local branch, but the Cisco GW still allocated 30 instead of 15 credits.