@arun.taga...@gmail.com <arun.taga...@gmail.com> Please check RFC 5626 3.3 <https://datatracker.ietf.org/doc/html/rfc5626#section-3.3>. Multiple Connections from a User Agent I believe you might find your answers here in this RFC which explains about creating multiple flows
Regards Ankur Bansal On Sat, Nov 20, 2021 at 10:27 AM Arun Tagare <arun.taga...@gmail.com> wrote: > Thanks Ranjit & Paul, > > Yes, NW can send ‘n’ number of PCSCF addresses, > > Yes, agree Ranjit it’s may be not practical but just wanted to understand > if that is allowed? Or Nw accepts REG in sequence like > > Reg to 1 PCSCF > Fail/error response from NW > Then retry on 2PCSCF address > Fail/error response from NW > Then retry on 3rd PCSCF address > Success from NW > > So, here UE is Registered success on 3rd PCSCF address. > > So, my question is it allowed to send Registration request to all received > PCSCF at the same time? > and assume UE registered on the 1 success response from NW and ignore > remaining. I m correlating Registration flow with INVITE forking responses > scenario here. > > Please let me know if it allowed? > > > On Sat, 20 Nov 2021 at 10:44 PM, Ranjit Avasarala <ranjitka...@gmail.com> > wrote: > > > Hi Arun > > > > I am not sure how you can get more than 1 P-CSCF address(s) as the P-CSCF > > address is discovered by UE i.e returned by GGSN. So even if we assume a > > scenario where the GGSN returns 5 P-CSCF address, then yes u can send > > REGISTER to all of them ( but this is not a practical scenario) > > > > Then as per the protocol, all 5 P-CSCFs will respond with 401 and the UE > > needs to keep track of all 5 401s and send REGISTER with authentication > to > > all of them. Then if we assume all of them accept then UE is > simultaneously > > registered with 5 P-CSCFs > > > > so though theoretically this may seem possible, but should not and will > > not occur in a practical scenario > > > > To understand more about P-CSCF discovery refer to 3GPP TS 34.229 > > > > Regards > > Ranjit > > > > On Sat, Nov 20, 2021 at 1:00 AM Arun Tagare <arun.taga...@gmail.com> > > wrote: > > > >> Hi Team, > >> > >> Need some info, can UE be allowed (as per rule) to send SIP REGISTER > >> requests to all the received P-CSCF addresses from NW (during attach) ? > >> > >> For Ex. > >> If UE received 5 P-CSCF address during attach > >> > >> Is it allowed to send REG to address at the same time > >> UE REG to P-CSCF-1---> > >> UE REG to P-CSCF-2---> > >> UE REG to P-CSCF-3---> > >> UE REG to P-CSCF-4---> > >> UE REG to P-CSCF-5---> > >> > >> <--- 401 from P-CSCF-2 > >> <--- 401 from P-CSCF-3 > >> <--- 401 from P-CSCF-5 > >> > >> UE AUTH-REG to P-CSCF-2---> > >> UE AUTH-REG to P-CSCF-3---> > >> UE AUTH-REG to P-CSCF-5---> > >> > >> <-- 200 OK from P-CSCF-5 > >> > >> So, UE finally connected to P-CSCF-5 > >> I know this may increase signalling load on NW, but want to understand > is > >> this flow allowed as per rules ? Or there are any restrictions please > help > >> on understanding > >> > >> > >> > >> -- > >> > >> With Regards > >> > >> Arun A. Tagare > >> +91 9449 029729 > >> _______________________________________________ > >> Sip-implementors mailing list > >> Sip-implementors@lists.cs.columbia.edu > >> https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > >> > > -- > > With Regards > > Arun A. Tagare > +91 9449 029729 > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
