The MPLS WG Archive

[Curtis Villamizar <curtis@fictitious.org>]

In message <5.1.0.14.0.20030218154944.0283e668@delta.info.net>, raymond zhang w
rites:
> 
> Regarding payload size, firstly the voice frame size varies with the ITU 
> codecs selected on the CPE.  For example, G.729a has 10ms per voice 
> sampling frame and one could configure to stuff either two or three frames 
> per VoIP packet... Hence 20 to 30 byte payload.  Larger payload size may 
> present an issue in terms of loss, esp for a global network since loss of 
> one packet would result in multiple voice frame losses.
> 
> As for vendors, I'd say any CPE vendors should have this capability built in.
> ..


I think the SPs should speak as to whether the bandwidth inefficiency
of 30 byte payloads or the potential to lose a packet with a 200 byte
is a greater problem.  All of the SP I've spoken to that are doing
VOIP are using diffserv EF service or otherwise insuring that voice
traffic is rarely if ever dropped.

Curtis