SDP - several format descriptions in same MediaDescription?

Hi:

Does anybody tried to include several formats in same media description using nist-sip?. This is, I've tried to do, for example:

m=audio 10001 RTP/AVP 0 8
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000

but, second attribute rtpmap deletes first one when using MediaDescription.setAttribute() method, and the sent sdp is like

m=audio 10001 RTP/AVP 0 8
a=rtpmap:8 PCMA/8000


The only way to do similar to this is to create two MediaDescription objects and send them separated, like this:

m=audio 10001 RTP/AVP 0 8
a=rtpmap:0 PCMU/8000
m=audio 10001 RTP/AVP 0 8
a=rtpmap:8 PCMA/8000

But this last sdp is more confused to be read. Does Anyone knows a solution to include several media formats into the same MediaDescription object.

Thank you.

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      Roberto Mier Escandón
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      P. T. Boecillo
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      Arquitecturas de referencia de plataformas para las nuevas redes

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