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Built-in STUN server for OpenSIPS
Thanks to Razvan Pistolea, there is a new STUN server(rfc 3489) module integrated in OpenSIPS.
Why an integrated STUN server module?
- A STUN server uses 2 ips and 2 ports to create 4 sockets on which to listen or respond.
- This integrated STUN module uses the SIPS sockets created by the OpenSIPS core:
- one (or two) of the sockets will overlap with the SIP signaling socket
- the rest will be created by this module for STUN only purposes.
- In the case of a bad behaving NATs (such as symmetric NAT) only this integrated STUN server will increase the likelihood of STUN to solve the NAT traversal for a wider range of NAT implementations. This translates into less need of media relaying (for NAT traversal purposes).
- It is important to set the primary_ip:primary_port to match the OpenSIPS signaling ip and ports.
- If OpenSIPS binds one more interface this module will use that too; so make sure you set the correct alternate_ip:primary_port.
- STUN requires 2 routable ip addresses; if in shortage create a virtual interface (i don't recommend because it destroys the purpose for some usages).
Opensips listening for signaling traffic:
for stun module we configure :
primary_ip = 220.127.116.11; primary_port = 5060 - overlapping with signaling socket
primary_ip = 18.104.22.168; alternate_port = 3478 - dedicated stun socket
alternate_ip = 22.214.171.124; primary_port = 5060 - dedicated stun socket
alternate_ip = 126.96.36.199; alternate_port = 3478 - dedicated stun socket
Documentation can be found here: http://www.opensips.org/html/docs/modules/devel/stun.html