Hi All,
I have got a question about Require: 100rel in ACK Request.

Presence of Require: 100rel header in ACK request is allowed?

RFC 3262 says "A Require header with the value 100rel MUST NOT be present in 
any requests excepting INVITE, although extensions to SIP may allow its usage 
with other request methods".

Regards,
Kavitha.


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