Hi Jerry 1) have the endpoints register with kamailio Just need to relay user requests to FreeSwitch and the responses back. 2) have the media proxy via RTPProxy as it is needed for NAT this is the main purpose of RTPproxy and RTPengine. 3) have the actual work (voicemail/ring groups/ivr/conference/etc...) done on Freeswitch yes, this will work. 4) have all the SUBSCRIBE/PUBLISH/PRESENCE done on Kamailio I do not use case when registration is stored on the FreeSwitch side and cannot comment. On Sat, Sep 18, 2021 at 12:15 AM Jerry Kendall &lt;Jerry.Kendall(a)bishophosting.com <mailto:Jerry.Kendall@bishophosting.com>> wrote: Hello all, I am new to the list but have been reading plenty. Loads of good tips and help. I am playing with Freeswitch and would like to put Kamailio/RTPProxy in front for the user endpoints. Freeswitch will talk directly with the service provider. I am wondering *if* i can do this... 1) have the endpoints register with kamailio 2) have the media proxy via RTPProxy as it is needed for NAT 3) have the actual work (voicemail/ring groups/ivr/conference/etc...) done on Freeswitch 4) have all the SUBSCRIBE/PUBLISH/PRESENCE done on Kamailio Is this doable? Are there any guides to setting this sort of thing up? regards, Jerry __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions   * sr-users(a)lists.kamailio.org <mailto:sr-users@lists.kamailio.org> Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe:   * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users <https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users> __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users