• "User Agents SHOULD
support sending and receiving an INVITE with a
• Replaces [RFC3891] header to allow the Call
Pickup operation. User
• Agents SHOULD support sending an INVITE with
a Join [RFC3911] header
• field to initiate bridging. UAs SHOULD either support receiving a
• Join header field or be configured to use a
conference server or
• B2BUA which supports the Join header
field.
•
• OPEN ISSUE: Replaces and Join support is
a SHOULD. This means
• that taking and bridging/joining calls
could fail if the UA does
• not support them. Can we make these a MUST so that we can
avoid
• these failures?”
•Proposal: Make Replaces and Join MUST for system - if a UA does not support accepting, a B2BUA could implement on behalf.