The Advanced SIP Settings view lets you configure detailed parameters for your SIP services.
| Item | Description |
|---|---|
| Sip Proxy servers | Proxies to allow incoming calls from. |
| Bind Interface | Restrict listening to particular WAN interface. |
| Bindport | Port to use for UDP listening. |
| User Agent | Custom User-Agent information in the SIP header. |
| RTP Port Range | Ports to use for RTP |
| DTMF Mode | Mode for DTMF (Compatibility / RFC 2833 / SIP INFO / Inband). |
| Register Interval | Time in seconds between registration attempts. |
| Realm | SIP Realm for digest authentication. |
| Localnet | Network addresses that are considered inside of the NAT network. |
| Register Attempts | Number of registration attempts before giving up. |
| Register Timeout | Time before giving up a registration attempt. |
| Register Back-off Attempts | Number of attempts before back-off. |
| Register Back-off Timeout | Time in back-off before giving up attempt to register. |
| Remote Hold | Send hold events to proxy (Let network handle music on hold). |
| SRV Lookup | Enable DNS SRV lookup. |
| DNS Manager | Enable Asterisk DNS manager. |
| DNS Manager Refresh Interval | Refresh interval for the DNS manager. |
| Line suffix in contact header | Add suffix to SIP contact header with information about called lines. |
| SIP DiffServ | Differentiated services type of service for SIP data. |
| Audio DiffServ | Differentiated services type of service for audio data. |
| Congestion tone | Tone to play on congestion. (Congestion / Info) |
| STUN server | STUN service provider. |
| TLS/SSL Version | TLS v1 / TLS v2 / TLS v3. |
| Cipher string | Cipher identifier string. |
| Trusted CA | Public key for a trusted Certificate Authority. |
To add a Trusted CA Certificate key: