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 > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
