We had several sites using Zen sip that were able to receive incoming calls but not make outgoing calls. The sip registration was showing as failed - although no changes had been made to it. The version of 3CX is 16.0.6.641 set to auto update.
The fix was to change the sip registration under "Registrar/Server/Gateway Hostname or IP" to "Auto Discovery" and to refresh registration. They showed immediately as registered and out going calls were possible again.
On checking with Zen they confirmed the accounts were registering on port 5060....
Not sure if this is the right place to post this - but hopefully it may help someone out.
The fix was to change the sip registration under "Registrar/Server/Gateway Hostname or IP" to "Auto Discovery" and to refresh registration. They showed immediately as registered and out going calls were possible again.
On checking with Zen they confirmed the accounts were registering on port 5060....
Not sure if this is the right place to post this - but hopefully it may help someone out.
