I have a query re routers and cisco phones. I am going to run @200 Cisco IP phones over a point-point wan link to a Cisco IPT system. My question is does the router need to have dsp chips to aid processing ? Thought these were only if you had e1 cards in the router ? Do they help with processing of voice packets just with IP phones directly connecting over the router or ar ethey simply not required and QoS and normal router processor will take care of it ?
One suggestion, I would suggest you to have DSPs on the remote router for conferencing purpose. In case you are planning to have conference facility. That way conference calls within the office (remote site users) will not have to traverse the WAN and go to the central conference resource for conferencing.
g729 = High Codec Complexity = High DSP Resource requirement.
With 200 phones over the WAN, and a E1 I would say put a PVDM 2-64 into the router.
(to allow for Voice Conferencing and Transcodeing Profiles)
At minimum use a PVDM 2-48
(will not allow for Voice Conferencing and Transcodeing Profiles)
If you debug the "dsp-resource-manager" you will find the "out of resource" where the PSTN call will fail. This indicate you do not have enough DSP resource to facilitate multiple 15-30 high complexity codec g729 calls.
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