Hi
Refer to RFC 3261, Pg 162, Table 2: Summary of header fields. It provides information about messages in which Contact header is mandatory (must be present) or optional (may or may not be present). Contact header in 100 Trying response for INVITE is optional. Header field where proxy ACK BYE CAN INV OPT REG ____________________ ________ _______ ____ ____ ____ ____ ____ ____ Contact R o - - m o o Contact 1xx - - - o - - Contact 2xx - - - m o o Contact 3xx d - o - o o o Contact 485 - o - o o o Regards Rohit Aggarwal Aricent -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of maverick me Sent: Friday, February 20, 2009 9:54 AM To: [email protected] Subject: [Sip-implementors] Contact-Header in 100 Trying... Hi All, Can 100 Trying have contact header? Is there any specification which says in which all SIP messages contact header can present. Regards, Ankit _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors ________________________________ "DISCLAIMER: This message is proprietary to Aricent and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error,please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. Aricent accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus." _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
