Anybody using GSM HR or EFR codecs?

Douglas Clowes dclowes1 at OPTUSHOME.COM.AU
Wed Feb 21 14:57:43 EST 2001


Anybody at all?

If so, what RTP payload types do you use and how do you signal the RTP
payload type in the Fast Start, OLC and/or OLCACK?

Douglas

At 06:56 20/02/2001 +1100, Douglas Clowes wrote:
>Could some kind soul please point me to the definitive guide to the use of
>RTP dynamic payload types in H.245. I've looked and can't seem to find any
>adequate coverage.
>
>If anybody has firm ideas how it's done, I would be pleased to receive the
>benefit of their knowledge.
>
>The documentation talks about the use of dynamic payload types in the use
>of alternative packetisation for video, but there seems to be a need for
>dynamic payload types in audio codecs which have H.245 code points, but not
>RTP static payload types (such as GSM HR and EFR).
>
>Dynamic payload types are being used for mode specification in SDP as well,
>with some MGs using them to specify the desired rate for G.723.1 (High or
>Low).
>
>IMHO, the standard needs to be expanded on the use of dynamic paylaod
>types, with particular reference to interworking with SDP based MGs and SIP.
>
>Cheers,
>
>Douglas Clowes
>
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