In versions 11.6 and 12.0, MRF SIP virtual servers will not start without an Advanced Protocols
license in addition to the LTM license. The license check happens when configuration is loaded,
/var/log/ltm file will contain a “MESSAGE ROUTING SIP feature not licensed” line. Since the check
only happens when config is loaded, no additional message will be displayed when trying to
connect to the virtual server.