Re: Implement VoIP over a 1Mbps Frame Relay/ATM PVC
the main issues you have to deal with are queueing and LFI. The best approach for queueing is LLQ (Low Latency Queueing). You might want to try "auto qos voip" on the respective interfaces to get started.
LFI (Link Fragmentation and Interleaving) takes care about jitter on a small (less than 768 kBit/s) access link. If VoIP packets have to wait for 1500 Byte data packet to be sent then it might take longer than the recommended 15 ms. The solution is to fragment on Layer2 with with fragment sizes less giving less than 15 ms jitter.
In the ATM case a second PVC is perfect for achieving this goal. "Fragment size" is 53 Byte - an ATM cell. Two Frame-relay PVCs will not help on this problem, better to use FRF.12 on one PVC.
Hope this helps
P.S.: There is a quite good QoS class (QoS 2.1) which explaines all that in detail.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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