Considerations for Multifrequency Signaling

Last Updated : Oct 30, 2012 |

This section provides information about how the Multifrequency Signaling feature behaves in certain circumstances. Use this information to ensure that you receive the maximum benefits of Multifrequency Signaling under all conditions. The following considerations apply to Multifrequency Signaling.

The following considerations apply to R2-MFC only:

  • Both non-group II signaling and group II signaling are supported on incoming MF signaling calls. The group II signaling protocol has an extra signal that provides caller-category information. Only group II signaling is supported on outgoing MF signaling calls.

  • MF signaling also can be used in tandem trunk groups. After address signals are collected from an incoming group II MF signaling call, the call can route to a group II MF signaling trunk.

  • Both incoming and outgoing MF signaling calls support ANI displays, ANI information and the CDR records the information.

  • When Communication Manager uses an open numbering plan, the end-of-dial signal must be defined in the incoming Group I signal administration. After sending all address digits, the CO sends the end-of-dial signal to Communication Manager.

  • If Communication Manager makes an outgoing call to the CO that uses an open numbering plan, the CO must send the signal A.1 to Communication Manager after sending the last address digit to the CO. Then, the CO should time out and send a pulsed signal A.3 to Communication Manager requesting the Group II signal.

  • Communication Manager offers the option to record the Calling Party Category in the CDR. For incoming external calls, this comes from the Group II signal. For internal calls and station-originated external calls, this comes from the COR of the originating station. For tandem calls, this value comes from the Group II signal, determined by the COR of the originating trunk group. The CDR device is capable of receiving this information.

  • You can assign Calling Party Category and Called Party Category on a trunk-by-trunk basis.

  • You can record an announcement to play when outgoing R2-MFC trunk calls do not complete. This applies when Communication Manager receives either group A or B signals from the called Central Office or other media server or switch.