[SIP SIMPLE client] Registering SIP command-line client to Cisco Call Manager?

[Robert Kulagowski]

On Tue, May 3, 2011 at 2:04 AM, Saúl Ibarra Corretgé
<saul at ag-projects.com> wrote:

> A SIP account consists in a nutshell of a SIP identifier (the SIP URI,
> user at domain.com) and a password. The authentication username may also be
> configured under the 'auth' section using the sip-settings script.

Thanks - is there documentation for the format of the config file?
The sip-settings command-line help didn't provide any obvious clues on
how to specify the authentication user ID.