[AVT] RTP Packet Type Numbers

["Joe Kelsey" <KELSEY at avtcorp.com>]

We are currently working on digital audio transport for airplane flight-deck audio.  Our plans include using a form of RTP to transmit the audio data between various interested parties in two different formats: 8kHz, 8-bit and 16KHz, 16-bit formats, modified for the flight-deck scenarios.

Our basic problem is that we want to simply have the various sources simply constantly transmit audio streams over the network without any session protocol.  As soon as power gets applied to the unit, it needs to transmit its assigned streams so that listeners can simply receive it.

This means that we want to use hardcoded packet type numbers in our RTP streams.  Currently we plan to use 77 for 8-bit, 8kHz audio and 78 for 16-bit, 16kHz audio streams.  RFC3551 says that we cannot do this but must rather use some sort of dynamic assignment protocol instead.  However, we need to operate in a very restricted network environment where we need to have strict controls over latencies and uncertainity, so we want to use fixed packet types.

Can we do this without violating any major rules?  What suggestions do you have about this general scheme?

Thanks.
/Joe



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