If behind a router/firewall, then the router/firewall must have all of the ports listed below opened/forwarded.
Web GUI:
- TCP: 80, 81, 443
SIP traffic:
- TCP: 10001, 5060-5069
- UDP: 4000-4999, 5060-5069, 10000-20000
PWProxy
- TCP: 10005, 10007, 10009
Jabber traffic:
- TCP: 5222 and 5223
Provisioning:
TFTP:
- UDP: 69
Central Phone Book:
- TCP: 11389, 11636