Hi TCP should be use when reliability is required. Also when dealing with large messages TCP should be used to avoid fragmentation of the messages over UDP.
For details please refer RFC 3261 section 18.1.1. " If a request is within 200 bytes of the path MTU, or if it is larger than 1300 bytes and the path MTU is unknown, the request MUST be sent using an RFC 2914 [36] congestion controlled transport protocol, such as TCP." regards Abhishek Dhammawat Aricent -----Original Message----- From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Kanta C Sent: Thursday, September 24, 2009 3:41 PM To: Sip Server Subject: [Sip-implementors] When to use TCP and UDP for sip request Hi All, Is there a rule for selecting the the transport layer protocol like when to use TCP or when to use UDP.... Regards, Kinnu __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu 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 Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
