Version 4

Used Symbols


Kamailio® (successor of former OpenSER and SER) is an Open Source SIP Server released under GPL, able to handle thousands of call setups per second. Kamailio can be used to build large platforms for VoIP and realtime communications – presence, WebRTC, Instant messaging and other applications.  Moreover, it can be easily used for scaling up SIP-to-PSTN gateways, PBX systems or media servers like Asterisk™, FreeSWITCH™ or SEMS.

Version 4

Tested with

Kamailio2N IP IntercomRegistraionCallsSecure RTP (SRTP)



Add new user in kamailio using kamctl tool. In following example 5000@ is number of extension on kamailio with IP address and 5000 will be a password to this extension.

kamailio@debian-kamailio:/home/kamailio# kamctl add 5000@ 5000

Output should look like following.

new user '5000@' added
In web configuration of your fill in credentials created in Kamailio.
  • Fill in Extension number in Phone (ID) and Authentication ID from 3CX PBX to Authentication ID.
  • Fill in the IP address of kamailio in to Domain, Proxy Address and Registrar address boxes.
  • Fill in your Authentication password  in to the corresponding box.

SRTP on 3CX Phone System

No special settings are required to be made in 3CX Phone System.

SRTP on 2N IP Intercom

Go to SIP settings in Services and in Advanced settings enable recieving and transmitting of SRTP calls.

Used Symbols

(tick) - Verified with video

(green star) - Verified with audio only

(warning) - Work with limitation

(error) - Incompatible