I am trying to setup a new remote extension.
I have already covered the security issues. Firewall is tight / Fail2Ban cranked up and many of the ext running deny/permit - all password over 20chars.
I setup port forwarding on firewall for ports 5060, 11000-20000(i ranged rtp port to start at 11000)
Ext. is set for NAT
So, jump forward - I am at the remote site last night - I goto add an Aastra 6739i unit was just factory reset. - Plug in the line 1 proxy server/port and register server/port
watching our cli (remote desktop) - i see the ext show now reachable
placed test call in and out - no audio - while i was checking setting in gui the other person there rebooted the phone - no big deal - i see the cli show the ext drop then come back up - but now it will not dial at all just call fail and when calling in goes to vm.
I checked nmap does not show the 5060 is open - it is forwarded on the router though - is this an issue as all of our int phones work and any additional input to why this ext is not working?