Subject: Re: [Sip] SIP Transport Selection Question

From: Rayees Khan <[email-masked]>
Date: Mon, 3 Jul 2006 14:09:03 +0530

Hi Joe,

My understanding is that since response has to follow the transport published in via header, the UAS does not have choice in choosing transport for response.

regards

Rayees

-----Joe <[email-masked]> wrote: -----

To: [email-masked]

From: Joe <[email-masked]>

Date: 07/01/2006 01:22AM

Subject: [Sip] SIP Transport Selection Question

Under the Clients section 3261 states:

"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 congestion controlled transport protocol, such as TCP."

Is this for "requests" (INVITE, etc.) only? What if an INVITE were sent as UDP but a response (200 OK) were to come back with extra headers which breached the MTU? Must the node sending the OK switch the transport to TCP? Is this optional?

Regards,

Joe

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This list is for NEW development of the core SIP Protocol
Use [email-masked] for questions on current sip
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