RTP header compression over MPLS link

[dgupta]

We have a situation where a VoIP connection fails when RTP header compression is turned on over a L3 MPLS link. The same VoIP connection works if put over a clear channel link.

Does MPLS support RTP header compression? Does it have to be configured differently for makeing it work over an MPLS link?

Rgs

Divesh

[Harold Ritter]

cRTP over MPLS L3 link is not supported.

Hope this helps,

[dgupta]

Hritter, Thanks for the response. Need calrification on this. Typically cRTP is done at the CPE end and if this just modifies the voice pay-load, why should it be not supported over an MPLS Link. As far as I understand, the payload is not modified in anyway when transporting an IP packet over MPLS link.

Rgs

Divesh

[tomanderin]

cRTP compresses the IP/UDP/RTP headers, not the payload

[Harold Ritter]

BTW: cRTP between the CE and PE is supported.