func (sm *FSSessionManager) onChannelAnswer(ev engine.Event, connId string) {
	if ev.GetReqType(utils.META_DEFAULT) == utils.META_NONE { // Do not process this request
		return
	}
	if ev.MissingParameter() {
		sm.DisconnectSession(ev, connId, MISSING_PARAMETER)
	}
	s := NewSession(ev, connId, sm)
	if s != nil {
		sm.sessions = append(sm.sessions, s)
	}
}