Proxy server

Allow loose routing (LR)

Parameter is defined for RFC 3261 compliant SIP proxy.
Parameter is not defined for SIP 1.0 specification-compatible strict routing mode.
It is recommended that this parameter is defined.

Proxy server address (ADDR)

The address of the SIP outbound proxy, leave empty if the outbound proxy is not used.

The address can be defined as an IPv4/6 address, domain name, or FQDN.

Value can be given without the sip: or sips: prefix, in which case sip: is automatically added.

If the proxy server is defined as a Fully Qualified Domain Name (FQDN), resolving the related IP address is achieved with the procedures specified within RFC 3263. A short summary is as follows:

If the FQDN is supplied without port and transport parameters, the phone will try to resolve it using the DNS NAPTR, SRV, and — finally — the A and AAAA queries.
If the FQDN is supplied without the port but with the transport parameter, the phone will try to resolve it using the DNS SRV, and — finally — the A and AAAA queries.
If the FQDN is supplied with the port parameter, the terminal will try to resolve it using the A and AAAA queries.

This setting creates a pre-route set according to RFC 3261; the Route header is inserted in the initial request.

The proxy has to insert Record-Route headers to keep itself in the route that is set on later requests inside a SIP session.

If the proxy server address is defined as a domain name, then neither the port parameter nor transport parameter shall be defined. The phone will try to resolve the related IP address using the DNS NAPTR, SRV, and — finally — the A and AAAA queries.

Port (PORTNBR)

TCP and/or UDP port the SIP proxy is listening to, the default value of 5060 is typically used.

Note:

If this parameter is present and parameter ADDR is not presented as IPv4/6 address, then NAPTR and SRV queries are skipped and an A or AAAA record lookup is made (see IETF RFC 3263 for more information).

User name (AAUTHNAME)

Required for proxy authentication, however the value need not be the same as the public user name. The authentication user name may be the user name part of the public SIP URI, but it may also contain the SIP domain or the SIP scheme as a prefix, that is:

This value depends on the proxy vendor and the configuration of their service.

Password (AAUTHSECRET)

Required if proxy authentication is used, the value is provided by the service provider.

Realm (AAUTHDATA)

The realm parameter sent by the proxy in the 407 response to the authentication challenge. The recommended value is the SIP domain. The value must be the same value as the proxy is configured to use. The values is case sensitive.

If no value is given for this parameter in the settings, it is read from the 407 response.

Authentication method (AAUTHTYPE)

This parameter indicates the authentication method used. The value must be HTTP-DIGEST.