CONFERENCE_HOST

This contact has merged this call into a conference.

Note that GSM provides a notification when the remote party merges a call into a conference, but not when it is split out again; thus, this flag can only indicate that the call has been part of a conference at some point. If a GSM connection manager receives a notification that a call has been merged into a conference a second time, it SHOULD represent this by clearing and immediately re-setting this flag on the remote contact.