0104 Merged Requests
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If the request has no tag in the To header field, the UAS core MUST
check the request against ongoing transactions. If the From tag,
Call-ID, and CSeq exactly match those associated with an ongoing
transaction, but the request does not match that transaction (based
on the matching rules in Section 17.2.3), the UAS core SHOULD
generate a 482 (Loop Detected) response and pass it to the server
transaction.
The same request has arrived at the UAS more than once, following
different paths, most likely due to forking. The UAS processes
the first such request received and responds with a 482 (Loop
Detected) to the rest of them.
Require
Assuming the UAS decides that it is the proper element to process the
request, it examines the Require header field, if present.
The Require header field is used by a UAC to tell a UAS about SIP
extensions that the UAC expects the UAS to support in order to
process the request properly. Its format is described in Section
20.32. If a UAS does not understand an option-tag listed in a
Require header field, it MUST respond by generating a response with
status code 420 (Bad Extension). The UAS MUST add an Unsupported
header field, and list in it those options it does not understand
amongst those in the Require header field of the request.
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