Calculation of rule DSP for voice routers

Hi all, I know that Cisco has a DSP calculator, however, there are some values that he asks that I'm not sure of when you try to use it.

Someone at - it a fundamental rule that they use when they decide how much DSP to add a router to voice FMC?

I have a Cisco 2911 with 1 VIC2-4FXO, 1 port VIC3-2FXS/DID and currently I have a PVDM3 DSP DIMM 1 with 16 channels. I would add a VIC2-2FXO card for additional analog lines. I read that you need at least to have the same number or channels that you have FXS/FXO ports. If this is the case, then I am currently using only 6 of the 16 channels.

Here is the command of DSP Group:

DSP groups on slot 0:
DSP 1:
State: UP, firmware: 32.1.2
Signal/voice of max channel: 16/16
Max credits: 240, voice credits: 240, video credits: 0
num_of_sig_chnls_allocated: 6
Transcoding allocated channels: 1
Group: FLEX_GROUP_VOICE, complexity: FLEX
Credit splitting: 100, reserved credits: 0
Signs of the allocated channels: 6
Voice of the allocated channels: 0
Appropriations used (rounded): 0
Group: FLEX_GROUP_XCODE, complexity: MEDIUM
Credit splitting: 0, reserved credits: 20
Transcoding allocated channels: 0
Appropriations used (rounded): 0
Group: FLEX_GROUP_CONF, complexity: CONFERENCE
Credit splitting: 0, reserved credits: 120
Codec: CONF_G729, maximum of participants: 8
Sessions by dsp: 4
Slot: 0
Idx device: 0
PVDM slots: 0
Type DSP: SP2600

Thank you

Dan

Yes, the most basic math are need at least the same number of channels on your DSP (s) that you would have TDM0 channels, which means that you will only use G.711, because the number of channels, G.711. This just for the termination of the TDM.

With what you have, if you decide to use G.729A/G.722, it would come down to 12 channels, with G.729/iLBC drops to 10, and you get only 3 channels, if you use the ICCS.

Tags: Cisco Support

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