Stephen, RFC 3263 Section 4.1 may answer your question. I quote " If the URI specifies a transport protocol in the transport parameter, that transport protocol SHOULD be used."
Regards Harsha On 16/01/2008, Stephen Paterson <[EMAIL PROTECTED]> wrote: > Hi Srini, > > It is also present in the Contact, Via and Request-Line and as I > understand it, these are necessary requirements (well, if future > communication is to be over TCP) but that's not the question. > > The question is, is it valid to have transport=tcp as a URI parameter in > the To and From headers? Calls are being rejected on this basis. I can't > find anything forbidding it although I will concede that it is rather > unnecessary. > > Cheers > > Steve > > -----Original Message----- > From: Krishnamoorthy Srini-A19809 [mailto:[EMAIL PROTECTED] > Sent: 16 January 2008 16:03 > To: Stephen Paterson; [email protected] > Subject: RE: [Sip-implementors] Transport=tcp interop problem > > > Isn't the "Contact" header more appropriate for Uas to indicate > the transport preference? Contact headers turn into request-URIs on the > way back and the proxies and UAs route on request-URIs/Route headers, > right?. We would obviously use the Via headers to indicate TCP properly > (SIP/2.0/TCP) in the forward direction - guess there is no question > there. > > -- > Srini > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Stephen Paterson > Sent: Wednesday, January 16, 2008 10:51 AM > To: [email protected] > Subject: [Sip-implementors] Transport=tcp interop problem > > Hi all, > > When using TCP, we place 'transport=tcp' in both the To and From headers > and it is claimed that the presence of this in the From header is > invalid (interestingly the To header is not causing any grief). It seems > to me that the From and To headers contain URIs and transport=tcp is a > valid URI parameter so there should be no problem. > > Can anyone clear this up as I can't find anything definitive in 3261? > Reference to the RFCs would be most appreciated. > > Cheers > > Steve > > > Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 > 1PT, UK > Registration No: 1397386 (Wales) > P Please consider the environment and don't print this e-mail unless you > really need to > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > -- Regards Harsha _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
