Folgende Verbindungen müssen seitens der Firewall erlaubt sein (Basisinstallation):
| Typ | Protokoll | Port | Direction |
|---|---|---|---|
| DNS | UDP | 53 | outbound |
| NTP | UDP | 123 | outbound |
| SIP | TCP/UDP | 5060 | inbound & outbound |
| SIPS | TCP | 5061 | inbound & outbound |
| RTP | UDP | 10000 - 20000 | inbound & outbound |
| Typ | Sekunden |
|---|---|
| NAT Keep Alive | 300 |
| UDP Session Timer | 300 |