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3CX Phone System for Windows System for Windows
Page 39
that it can send and receive UDP data on port 5060 (for SIP), port 3478 (for STUN) and
port 9000 to 9016 (for up to 8 simultaneous calls, default setting). If it can, the firewall
check will succeed. If the firewall check fails, you will not be able to reliably make and
receive VoIP provider calls and you will have to edit your firewall configuration. Note that
we do not provide firewall configuration support.
Specifying a STUN server
Although 3CX includes a default STUN server setting, it is recommended that you specify
the STUN server suggested by your VoIP provider as your default STUN server. First of
all the STUN server suggested by your VoIP provider is probably closer to you and
therefore quicker to reach (less hops). Secondly it’s probably a lot less.
The faster the
STUN server responds to requests, the quicker the call will be setup.
To specify a different STUN Server:
1. In the Management Console, go to Settings > Network node. Now click on the ‘STUN
server’ tab.
Screenshot 9 - Speciyfing STUN server
2. In the edit box ‘Primary STUN server’ specify the STUN server suggested by your
provider, for example stun.sipgate.net:10000
3. You can specify an alternate backup server, or leave the stun2.3cx.com as the backup
STUN server. This address will be used if the primary STUN server is down. Click OK to
exit and save the settings.