VoIP end to end, with packet to cell conversion between your two ATM router cards.
Using a PVC for voice only is your best bet.
Just make sure that you're using the right QoS parameters before and when the packets/call conversions.
What kind of bit rate is the ATM ciruit provided to you.
If you have a option request VBR-rt (real time), as
variable bit rate (VBR) circuits have a high service class.
The most significant architectural advancements at the router-switched boundary involve the management of the traffic queues. It is these queues that ensure that higher-priority data is expedited ahead of lower-priority data.
As far as voice channel compressions are concerned, that'll all depend on how many voice calls are going to go through the pipe. Without compression, PCM G.711 you'll be able to run maybe 6 voice channels at a time.
Being that you have an E1 PRI card with 30 voice channels, I would suggest you use CELP (G.729)compression at 12kbps (with ip overhead), and not enable VAD.
This way you can have all your 30 channels up and plenty of bandwidth for packet to cell overheads.
In this case you would not use silence compression (VAD), and you would have to compress the IP RTP header.
On the other hand, if you don't need 30 channels running at the same time, than you can get 20 voice channels using CELP without IP RTP header compression. These voice calls with take up to 24 kbps of bw, and the router CPU will not be utilized as much.
On the PBX side you don't have to do anything with voice channels. The TDM to packet conversion will be done on the router, and on the router you have to specify what compression algorithm you want to use, VoIP and pots dial-peers as well as class-maps and policy-maps for QoS. The QoS (CoS in your case) has to be mapped to the ATM (outside/inside) ports, so you can get high level Quality of Service.
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