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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1438Multifrequency Signaling
20
Multifrequency Signaling
Multifrequency (MF) signaling is a form of address signaling used between
switches and the central office (CO). It is similar to dual-tone multifrequency
(DTMF) signaling in that tones convey the dialed number.
With MF signaling, the signal is typically a combination of two frequencies from
a group of 5 or 6 frequencies (2/5 or 2/6). The origination switch and destination
switch exchange tones that have specific meanings according to the MF protocol.
Detailed description
DEFINITY ECS supports two frequency groups:
■ R2-multifrequency compelled signaling (R2-MFC) frequency
■ R1 frequency (for Spain and Russia)
R2-MFC is a version of MFC recommended by the International
Telecommunication Union (ITU). It provides signaling between a CO and a
switch over analog or digital CO, Direct Inward Dialing (DID), or Direct Inward
and Outward Dialing (DIOD) trunks. It also provides signaling between 2
DEFINITY switches.
DEFINITY ECS provides MF signaling that complies with ITU regulations and
national regulations for specific countries. It provides these types of MF signaling:
Multifrequency Espana (MFE), MF Shuttle, and multifrequency compelled
(R2-MFC). These protocols signal the called number, the calling party’s number
(automatic number identification (ANI)), and information about the type of call or
type of caller (category).
DEFINITY ECS allows prefix digits for ANI sent on outgoing calls to be defined
per PBX or per the originator’s class of restriction.
If a call is a tandem call and the incoming and outgoing trunk use different
protocols, the switch makes no attempt to convert between the various protocol’s
meanings for category. Instead,
■ the PBX uses the incoming trunk’s Class of Restriction (COR) assigned
category if the outgoing trunk is Russian or R2-MFC, and
■ the PBX uses ARS call types if the outgoing trunk is MFE.
DEFINITY ECS provides the incoming ANI to all features on the switch that need
to identify the calling party.