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Capabilities Exchange
Each peer sends capabilities summary during session startup
Capability is used only if both parties advertise the same version of the same capability
Capability expressed as a URI
http:/ietf.org/xmlconf/1.0/base http:/ietf.org/xmlconf/1.0/base#notifications http:/ietf.org/xmlconf/1.0/base#candidate http:/ietf.org/xmlconf/1.0/base#lock
At least 1 version of the base protocol must be advertised
Vendor specific capabilities may also be advertised
http:/example.com/xmlconf/1.0/extensions
Base protocol + optional capabilities
PPT Version