Defiantly it is valid, because there may be SBC in between UE and PCSCF In this case SBC will absorb all the service routes, Path coming from PCSCF Side.
And in PDP on DHCP IP of SBC will be published, So UE will assume SBC as outbound proxy, But again the question come will there be route header or not in INVITE from UE :-) Regards, Amit Goyal >-----Original Message----- >From: Vikram Chhibber [mailto:[EMAIL PROTECTED] >Sent: Monday, September 03, 2007 8:18 PM >To: Peili Xu >Cc: Goyal, Amit; [email protected] >Subject: Re: [Sip-implementors] Route Header in INVITE. > >Hi Peili, you should be right but can you point me to the spec. where >this is specified explicitly? Is there any 3gpp test suite behavior >for this case? I understand that 3gpp has defined behavior for PCSCF >when INVITE is received with Route headers and its validation, but >where have they specified the behavior when it's missing? >In general, should we go implementing a very strict compliant solution >or follow the SIP philosophy in general of "Be lenient in what you >expect and strict in what you send?". > >Thanks, >~Vikram > >On 9/3/07, Peili Xu <[EMAIL PROTECTED]> wrote: >> I don't think in the IMS specification, 200 without Service-Route >> header is an valid case. >> >> Peili >> >> 2007/9/3, Vikram Chhibber <[EMAIL PROTECTED]>: >> > Depending on the implementation, option one is also correct as PCSCF >> > is considered as the outbound proxy whose address is not specified in >> > the Route header. >> > But the basic point is, if UE does not know the path to SCSCF, it can >> > send the message to its outbound proxy i.e. PCSCF which knows how to >> > forward the message to calling party home network. >> > >> > On 9/3/07, Goyal, Amit <[EMAIL PROTECTED]> wrote: >> > > Hi, >> > > >> > > >> > > >> > > In IMS environment if we get 200 OK for REGISTER without Service-Route, >> > > Then what should be the Route set for out going INVITE ? >> > > >> > > >> > > >> > > 1. No Route >> > > >> > > OR >> > > >> > > 2 Route with only P-CSCF Address >> > > >> > > >> > > >> > > Or something else. >> > > >> > > >> > > >> > > Regards, >> > > >> > > Amit >> > > >> > > _______________________________________________ >> > > Sip-implementors mailing list >> > > [email protected] >> > > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> > > >> > _______________________________________________ >> > Sip-implementors mailing list >> > [email protected] >> > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> > >> _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
