SIP

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: