Voice over ATM/Frame

[john.fleming]

Hello, I am trying to find out about doing centralized voice mail over my WAN.

I currently have a Frame to ATM network. With this there is no ability for QoS. I am taking a Frame connection and pointing it to ATM over IMA.

Is voice feasible over this kind of connection? Are any of you doing this?

[ryan.hicks]

You can do this.

You can use frame relay fragmention and rtp header compression on the frame-relay side. This will dice up the frame relay packets into whatever size you wish. The ATM is already a nice 53 bytes. The rtp header compression you can do on both the ATM and frame sides. You can then map your COS (layer 2 packets) with DSCP values and then map that to an access-list. All of this will allow you to mark VOIP traffic and call control traffic and prioritize in/out the WAN ports. The ATM side sees the physical T-1s as one logical IMA interface so that really does not matter.