[SIP SIMPLE client] Sylkserver problem to start when editing config.ini file

[Adrian Georgescu]

>  -  when someone in room, he can make call out to invite his friend to join the room
>  -  how to remove someone out of the room

See RFC4579

 * Conferencing for User Agents

   5.1  INVITE: Joining a Conference Using the Conference URI - Dial-In
   5.2  INVITE: Adding a Participant by the Focus - Dial-Out
   5.5  REFER: Requesting a Focus to Add a New Resource to a Conference
   5.11 REFER with BYE: Requesting a Focus to Remove a Participant from a Conference