Each ISUP Media Channel object is a child of an ISUP Remote Signaling Destination object.
This object contains configuration parameters and status information for an ISUP Media Channel. A Media Channel is defined for a set of Circuit Groups with the same local exchange and the same remote exchange and typically the same quality of service. A media channel is uniquely identified by the local and remote exchanges and a media channel index, or by a trunk group ID.
![]() |
Note that the MetaSwitch concept of a Media Channel corresponds closely to the DMS/5ESS Trunk Group; both define a collection of DS0s which may span multiple DS1s. |
Each media channel maintains a list of the associated circuit groups, each referenced by the CIC of the base circuit. Each associated circuit group references its associated media channel using the media channel index.
Routes are defined using Media Channels rather than individual circuit groups because it generates simpler routing tables.
There is no need to define an ISUP Media Channel for a one-way incoming trunk; it is required only for two-way or one-way outgoing trunks.
For initial configuration of an ISUP Media Channel, you need to do the following:
Parameter |
Access |
Description |
Media channel index | Change | Local index identifying the media channel. This index is referenced by the Circuit Groups which are associated with the media channel. |
Allocation policy | Change | Specifies the circuit allocation policy to be used by the local exchange for allocating circuits within the media channel. (This should be different from the value used at the remote destination.) Values:
|
Guard timer duration | Change | Duration, in ms, of the guard timer. The default is 750ms. |
Dual seizure policy | Change | Policy used to determine the dual seizure controlling exchange for circuits within this media channel. (This should be different from the value used at the remote destination.) Values:
|
% utilization | Read only | Percentage utilization of the media channel. This is calculated by dividing the number of allocated circuits by the total number of circuits in the media channel and multiplying the result by 100. |
Alarm state | Read only | Specifies whether any alarms are currently raised for this object. Values:
|
Alarm log correlator - Attention Required | Read only | Identifier of the log message for the event that caused the last Attention Required alarm state for this object. This field is reset when the Attention Required alarm events field is reset to zero. |
Attention Required alarm events | Read only / Reset | Number of times (since the alarm count was reset) that this object's alarm state has gone to Attention Required. |
Alarm log correlator - Attend To Dependent | Read only | Identifier of the log message for the event that caused the last Attend To Dependent alarm state for this object. This field is reset when the Attend To Dependent alarm events field is reset to zero. |
Attend To Dependent alarm events | Read only / Reset | Number of times (since the alarm count was reset) that this object's alarm state has gone to Attend To Dependent. |
Alarm state changed timestamp | Read only | The time at which the Alarm state last changed. |
Alarm events reset timestamp | Read only | The time at which the Attention Required alarm events was last reset to zero. |
Requested status | Read only | Specifies whether an administrator has attempted to activate the ISUP Media Channel. Values:
|
Actual status | Read only | Specifies the current status of the ISUP Media Channel. Values:
|