Packetizer

What is the relationship between the CapabilityTableEntryNumber and the CapabilityDescriptorNumber in H.245? (Q77)


The information in this article applies to: H.245

Descriptors, which are numbered, contain references to table entries via table-entry numbers, but there is no relationship between the two numbers. CapabilityDescriptorNumber is the "tag" for a descriptor; CapabilityTableEntryNumber is the "tag" for a table entry. For example, the following capability set indicates that this EP prefers to receive G.723.1 and H.263 but that it can also receive G.711 and H.263.

Entry #Capability
1receive G.723.1 audio
3receive H.263 video
2receive G.711 audio
10receive H.261 video

Descriptor #Capabilities
2entry #1 and entry #3
5entry #2 and entry #3