The Managed Telephony Service ( MTS ) contract expired on 31 December 2011 .
The Managed Telephony Service ( MTS ) contract was replaced by the Managed Telephony Convergence Framework ( MTCF ) .
The Managed Telephony Service ( MTS ) contract expired on 31 December 2011 and was replaced by the Managed Telephony Convergence Framework ( MTCF ) .