techblog 

SJphone is a popular free VoIP client (or “softphone”), available for Windows, Linux, and MacOSX.

Most softphones have separate settings for the username and password used to authenticate the SIP REGISTER command, and another to set the SIP Address of Record. SJphone, by default, does not. It has the username and password fields, but it generates a default SIP AoR of username@domain.

There didn’t appear to be any way to support our configuration where the Authentication username is different to the left-hand side of the SIP AoR. After much digging a solution was finally found. In the “Profiles” dialog box there is an “Initialization” tab. On this tab there is a “Caller ID” setting and a tick box marked “Inquired”:

Ticking this box tells SJphone to prompt for the left-hand side of the SIP AoR along with the username and password fields. The other two tick boxes control whether the application remembers the supplied value, or prompts for it each time.

If necessary you can tick the “Full Address of Record” box instead, should you need to supply a SIP AoR with a different right-hand side.