2011/3/10 Brett Tate <[email protected]>:
>> I need to know is there any significance of a modified PAID
>> header in Re-INVITE.
>
> RFC 5876 provides some information on the topic.
3.2. Inclusion of P-Asserted-Identity in Any Request
In one example, an established call passes through a gateway to the
PSTN. The gateway becomes aware that the remote party in the PSTN
has changed, e.g., due to call transfer. By including the
P-Asserted-Identity header field in an UPDATE request, the gateway
can convey the identity of the new remote party to the peer SIP User
Agent (UA).
Note that the (re-)INVITE method could be used in this situation.
However, this forces an offer-answer exchange, which typically is
not required in this situation. Also, it involves three messages
rather than two.
--
Iñaki Baz Castillo
<[email protected]>
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