Christer, In what you describe below, you are assuming that in order to use your super-fast-broadband access for video, you would also have to do your related SIP transactions over the same interface. In general this is not true, as you could as well run SIP over your jungle-drum interface while putting the broadband interface addresses in your SDP.
But I suppose we are talking about networks where some B2BUAs will get confused if you try the media from a different IP address from where you do SIP (although if you have something like a carrier grade NAT between the UA and the B2BUA there is no guarantee that SIP and RTP would come from the same IP). Perhaps it would be good enough to use two different instance id's? Markus >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On >Behalf Of ext Christer Holmberg >Sent: 20 October, 2008 08:56 >To: Dean Willis; SIP IETF >Subject: Re: [Sip] Stupid question on flow use in outbound > > >Hi, > >>Assume Bob's UA is using outbound and is registered with two flows. >>Both flows use the same instance-id. The first flow goes through edge- >proxy 1 and has reg-id 1. The second flow goes through proxy 2 >and has reg-id 2. >> >>Both flows are "live" from a keepalive perspective. >> >>Alice calls Bob. >> >>Which flow gets exercised? >> >>Where in Outbound is this described? If it is not in Outbound, is it >described somewhere else? If it is simply >left-to-the-implementation, does this need to be explained somewhere? > >I guess it is (for good or bad) left-to-the-implementation. > >HOWEVER, one thing which has been discussed, and which I think >we SHOULD say something about, is whether it's allowed to use >a different set of user capabilities for each flow. > >Personally I think it would be useful. For example, I could >indicate that I want to receive incoming video calls over my >super-fast-broadband access, instead of my slow jungle-drum access. > >I don't think we would need very much text for this either. >Maybe a note saying something like: > >"NOTE: A user MAY register different set of user capabilities >(using the mechanism in [ref-to-RFC3840] on each flow, if the >user wishes the registrar to choose a particular flow based on >caller preferences [ref-to-RFC3841]." > >...or something like that. > >Regards, > >Christer > >_______________________________________________ >Sip mailing list https://www.ietf.org/mailman/listinfo/sip >This list is for NEW development of the core SIP Protocol Use >[EMAIL PROTECTED] for questions on current sip >Use [EMAIL PROTECTED] for new developments on the application of sip > _______________________________________________ Sip mailing list https://www.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use [EMAIL PROTECTED] for questions on current sip Use [EMAIL PROTECTED] for new developments on the application of sip
