Hello Alex, I switched to aliases method, but in case like this, AU ----> Internet ---> Kamailio ----> Asterisk AU2 <--Internet <---------| <------------| Call between two extensions not working, because kamailio mark as external domain and LOCATION not saved, but even if I save location I see in kamctl ul show more then 5 records for each AOR. Slava. From: "Slava Bendersky" &lt;volga629(a)networklab.ca&gt; To: "sr-users" &lt;sr-users(a)lists.sip-router.org&gt; Sent: Sunday, March 29, 2015 9:52:18 AM Subject: Re: [SR-Users] NAT Contact: Hello Alex, I switched to alias method, but there some CRITICAL message. Mar 29 09:54:45 canlvprx01 kamailio: 2(31248) ERROR: *** cfgtrace:request_route=[NATDETECT] c=[/etc/kamailio/kamailio-asterisk.cfg] l=905 a=16 n=if Mar 29 09:54:45 canlvprx01 kamailio: 2(31248) ERROR: *** cfgtrace:request_route=[NATDETECT] c=[/etc/kamailio/kamailio-asterisk.cfg] l=901 a=24 n=is_first_hop Mar 29 09:54:45 canlvprx01 kamailio: 2(31248) DEBUG: siputils [sipops.c:161]: w_is_first_hop(): no 2nd via found - first hop Mar 29 09:54:45 canlvprx01 kamailio: 2(31248) CRITICAL: <core> [route.c:1237]: comp_num(): Invalid right operand (1) Mar 29 09:54:45 canlvprx01 kamailio: 2(31248) ERROR: *** cfgtrace:request_route=[NATDETECT] c=[/etc/kamailio/kamailio-asterisk.cfg] l=902 a=5 n=route Mar 29 09:54:45 canlvprx01 kamailio: 2(31248) ERROR: *** cfgtrace:request_route=[ADD_CONTACT_ALIAS] c=[/etc/kamailio/kamailio-asterisk.cfg] l=976 a=16 n=if Mar 29 09:54:45 canlvprx01 kamailio: 2(31248) ERROR: *** cfgtrace:request_route=[ADD_CONTACT_ALIAS] c=[/etc/kamailio/kamailio-asterisk.cfg] l=971 a=24 n=add_contact_alias Mar 29 09:54:45 canlvprx01 kamailio: 2(31248) DEBUG: nathelper [nathelper.c:970]: add_contact_alias_0_f(): no need to add alias param From: "Alex Balashov" &lt;abalashov(a)evaristesys.com&gt; To: "sr-users" &lt;sr-users(a)lists.sip-router.org&gt; Sent: Saturday, March 28, 2015 7:31:54 PM Subject: Re: [SR-Users] NAT Contact: On 03/28/2015 07:26 PM, Slava Bendersky wrote: I wouldn't think so. -- Alex Balashov | Principal | Evariste Systems LLC 303 Perimeter Center North, Suite 300 Atlanta, GA 30346 United States Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/ _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users