The SIP clients package consists of multiple command line scripts:
[Sip Audio Session]
[Sip Message]
[Sip Publish Presence]
[Sip register]
[Sip session]
[Sip settings]
[Sip subscribe mwi]
[Sip subscribe presence]
[Sip subscribe rls]
[Sip subscribe winfo]
[Sip subscribe cap diff]