Can anyone help me out the a recommend DSP configuration?
We have a 2811 w/ a PVDM2-16 and a VIC2-4FXO card. I would like to best utilize the DSP resources for MOH, Transfer, and conferencing. We are running CME 4.0(3). We aren't doing any VoIP over the WAN with this site yet but would like to have this ability in the future. I have tried to use the DSP calculator but I really want to know what my options are for the DSP that I have, not vice versa.
Any help would be great!
Again, for all intents and purposes, a single 5510 DSP (PVDM2-16) will support *EITHER* 8 transcoding sessions *OR* 8 medium complexity audio calls (G.729a/G.729ab) *OR* 16 low complexity audio calls (G.711).
In my previous post I stated that you pretty much need to assume that a single DSP will only give you 8 channels to work with in most situations. Since it appears that you have 4 channels of hardware analog voice, which will automatically reserve 4 DSP channels, that leaves you with 4 channels for transcoding.
As long as you configure the voice-card 0 for 'codec complexity flex' on your router and expect all hardware analog calls to terminate as G.711, then you *COULD* configure 6 transcoding sessions with a single DSP. The worst case scenerio with this config is if any of the hardware analog calls terminate with a medium complexity codec you will loose 1 or 2 of your transcoding channels during the call(s).
Let me explain it this way, the 5510 DSP when running flex software is broken up into 16 logical channels. Each of the 16 DSP channels can handle a low complexity call (G.711 or fax passthru). A medium complexity call uses the equivalent resources of 2 DSP channels to terminate the call. A transcoding session to or from a medium complexity call (G.729a/G.729ab) from G.711 uses 2 DSP channels.
Have you ever used the DSP calculator on Cisco's web site?
CLI Information for Optimal results.
To match the DSP Calculator configuration with your router, enter the following commands in configuration mode in your Cisco 2811 router:
codec complexity flex
!Set of Conferencing/Transcoding commands when used with PVDM2-XX DSPs:
sccp ccm identifier version
sccp ccm group 999
associate ccm priority 1
associate profile register
dspfarm profile transcode
maximum sessions 6
associate application SCCP