[AVT] RFC3550 RTP Session defintion Q

In the RFC 3550 RTP session definition it is written:

“A participant distinguishes

multiple RTP sessions by reception of different sessions using

different pairs of destination transport addresses”

While at the end of the paragraph it is written:

“All participants in an RTP session may

share a common destination transport address pair, as in the case

of IP multicast, or the pairs may be different for each

participant, as in the case of individual unicast network

addresses and port pairs. In the unicast case, a participant may

receive from all other participants in the session using the same

pair of ports, or may use a distinct pair of ports for each”

How can one have distinct pair of ports for each participant in a RTP session while still maintaining the definition that different sessions have different destination transport addresses? Can anyone help me understand this contradiction?

Thanks,

Oren Peleg

Voice Engines Team Leader

Research and Development

AudioCodes

Tel: +972-3-976-4167

Fax: +972-3-976-4223

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