Hi, Christoph.
To serve different domains you need to map fqdn received from UE/multiple domains - to the naptr of your I-CSCSF.. 

To achieve that in my IMS setup I created  3gppnetwork.org.zone which resolve all dns naptr queries like ims.mnc0xx.mccyyy.3gppnetwork.org - to naptr record of local I-CSCF - like below:
*.3gppnetwork.org.              1D IN NAPTR 30 100 "s" "SIP+D2U"        ""      _sip._udp.ims.mnc001.mcc001.3gppnetwork.org.
--
obelousov.tel


On Mon, 20 May 2024 at 00:03, Valentin Christoph via sr-users <sr-users@lists.kamailio.org> wrote:

Dear IMS enthusiasts :-)

 

Has anyone experience with Kamailio IMS (CSCF) setups, where users with different domain names can be registered at one and the same S-CSCF?

 

Is this feasible at all?

 

I mean one IMS for users <user>@ims1.example.com, <user>@ims2.example.com, <user>@ims3.example.com,…….. in one and the same S-CSCF, I-CSCF, P-CSCF.

 

Thanks,

Christoph

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