Hello Daniel, Thank you so much for your reply! Below is my code (just testing our UAC module) and I am unable to start kamailio after adding these codes: I have loadmodule tm and rr as well. loadmodule "uac.so" request_route { . . $uac_req(ruri)="sip:10.118.226.43"; uac_req_send(); . . In request route I added the above 2 lines of code and then I tried to start Kamailio… root@emps116:/etc/kamailio# service kamailio start Job for kamailio.service failed because the control process exited with error code. See "systemctl status kamailio.service" and "journalctl -xe" for details. root@emps116:/etc/kamailio# systemctl status kamailio.service ● kamailio.service - Kamailio (OpenSER) - the Open Source SIP Server Loaded: loaded (/lib/systemd/system/kamailio.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) since Tue 2017-07-25 12:35:45 PDT; 6s ago Process: 29891 ExecStart=/usr/sbin/kamailio -P /var/run/kamailio/kamailio.pid -f $CFGFILE -m $SHM_MEMORY -M $PKG_MEMORY -u $USER -g $GROUP (code=exited, status=255) Main PID: 27407 (code=exited, status=0/SUCCESS) Jul 25 12:35:45 emps116 systemd[1]: Starting Kamailio (OpenSER) - the Open Source SIP Server... Jul 25 12:35:45 emps116 kamailio[29891]: ERROR: <core> [cfg.y:3235]: yyparse(): cfg. parser: failed to find command is_method (params 1) Jul 25 12:35:45 emps116 kamailio[29891]: CRITICAL: <core> [cfg.y:3375]: yyerror_at(): parse error in config file /etc/kamailio/kamailio.cfg, line 473, column 24: unknow Jul 25 12:35:45 emps116 kamailio[29891]: ERROR: bad config file (5 errors) Jul 25 12:35:45 emps116 kamailio[29891]: loading modules under config path: /usr/lib/x86_64-linux-gnu/kamailio/modules/ Jul 25 12:35:45 emps116 systemd[1]: kamailio.service: Control process exited, code=exited status=255 Jul 25 12:35:45 emps116 systemd[1]: Failed to start Kamailio (OpenSER) - the Open Source SIP Server. Jul 25 12:35:45 emps116 systemd[1]: kamailio.service: Unit entered failed state. Jul 25 12:35:45 emps116 systemd[1]: kamailio.service: Failed with result 'exit-code'. root@emps116:/etc/kamailio# root@emps116:/etc/kamailio# kamailio -v version: kamailio 4.4.6 (x86_64/linux) flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: unknown compiled with gcc 4.9.2 root@emps116:/etc/kamailio# Thanks, Anu *From:*Daniel-Constantin Mierla [mailto:miconda@gmail.com] *Sent:* Tuesday, July 25, 2017 12:42 AM *To:* Kamailio (SER) - Users Mailing List &lt;sr-users(a)lists.kamailio.org&gt;rg>; Anuradha Selvarajan &lt;anuradha.selvarajan(a)ericsson.com&gt; *Subject:* Re: [SR-Users] Can kamaillio act as user? Hello, uac is the module that is able to do registrations to remote servers. What are the error you get? Also, give the output of kamailio -v Cheers, Daniel On 24.07.17 23:07, Anuradha Selvarajan wrote: Hello, Can Kamaillio act as a user and send SIP registration? If yes, how/which module and any sample config? I tried to use UAC module but errored while loading the module inspite of loading it after TM/RR module. Thanks Anu _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org <mailto:sr-users@lists.kamailio.org> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users -- Daniel-Constantin Mierla www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda> Kamailio Advanced Training - www.asipto.com <http://www.asipto.com> Kamailio World Conference - www.kamailioworld.com <http://www.kamailioworld.com>