Hi Oleg,

This is supported by Kamailio IMS and we use it rather frequently.

However, one point is your description is not properly right:
" constructs Register message (which keeps all details of subscriber register message) "

If you need to have all the details of the subscriber register message (e.g. REGISTER sent by the UE), you will not find them by default in the 3rd Party registration generated by Kamailio, as it is creating a new REGISTER (e.g. it has a new Call-ID, Contact pointing to the IMS rather than to the UE, ...). However, you can instruct the HSS to include the original REGISTER message as a message body or you can do a "SUBSCRIBE" (check PUA_reginfo and related modules) for the user status in order to get more details of the subscriber.

Thanks,
Carsten
--
Carsten Bock I CTO & Founder

ng-voice GmbH

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T +49 179 2021244 I www.ng-voice.com

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Managing Directors: Dr. David Bachmann, Carsten Bock



Am Mi., 21. Dez. 2022 um 14:16 Uhr schrieb Oleg Belousov <obelousov@gmail.com>:
Hi.
Can you please advise if existing ims implementation supports integration with ims AS (Application Server), in particular for the third party registration:
- upon UE registration is completed, S-CSCF constructs Register message (which keeps all details of subscriber register message) and submits it to AS server as regular SIP-message (TS 24.229 5.4.1.7 Notification of Application Servers about registration status). S-CSCF obtains AS address from SAA (Server Assignment Answer) diameter message, received from HSS upon successful registration.
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