Communication Manager supports two frequency groups:
R2-MFC is a version of MFC recommended by the International Telecommunication Union (ITU). It provides signaling between a CO and a media server over analog or digital CO, Direct Inward Dialing (DID), or Direct Inward and Outward Dialing (DIOD) trunks. It also provides signaling between any 2 servers running Communication Manager.
Communication Manager provides MF signaling that complies with ITU regulations and national regulations for specific countries. It provides these types of MF signaling: MFE MF Shuttle, and multifrequency compelled (R2-MFC). These protocols signal the called number, the calling party’s number (ANI), and information about the type of call or type of caller (category).
Communication Manager supports prefix digits for ANI sent on outgoing calls to be defined per server, or per the originator’s class of restriction.
If a call is a tandem call and the incoming and outgoing trunk use different protocols, Communication Manager makes no attempt to convert between the various protocol’s meanings for category. Instead,
the server uses the incoming trunk’s COR assigned category if the outgoing trunk is Russian or R2-MFC, and
the server uses ARS call types if the outgoing trunk is MFE.
The server running Communication Manager provides the incoming ANI to all features on Communication Manager that need to identify the calling party.
