Hello Gintaras, you need to give a bit more details what exactly is not working. Have you already created some SIP network traces to look into the not working case? You can do that with e.g. wireshark/tcpdump or ngrep tools Cheers, Henning -- Henning Westerholt – https://skalatan.de/blog/ Kamailio services – https://gilawa.com<https://gilawa.com/> From: sr-users &lt;sr-users-bounces(a)lists.kamailio.org&gt; On Behalf Of Gintaras Kazakevicius Sent: Thursday, February 6, 2020 10:17 AM To: sr-users &lt;sr-users(a)lists.kamailio.org&gt; Subject: [SR-Users] asterisk kamailio mobile network Hello, need help. Call from mobile to asterisk: Mobile network provider <trunk> Kamailio <-> Asterisk --- working Call from asterisk to mobile Asterisk <-> Kamailio <trunk> Mobile network provider --- not working How to configure? Maybe you have working example of this solution?