Packetizer

What Happens When Both EPs Start Capability Exchange At The Same Time? (Q71)


The information in this article applies to: H.245

Nothing happens. That's the way it's supposed to work. Each EP tells the other what it can do. Unlike opening a bi-directional channel for the same media, for example, where there would be a conflict, the transmission of the EPs' TermCapSets are independent of each other.

There is sometimes confusion about the cap exchange. Some people think of it as a negotiation with an iterative back-and-forth dialogue as the EPs eventually come to some sort of agreement on what they will do during the call. But this is not the case. It's a simple request/response dialogue from each side.