D-Channel Service Message Support

Parameter group

ISDN signaling

Access level

Admin

Possible values

Yes
No

Defaults

No

Explanation

Selecting yes will enable D-channel Service Messages to be supported by the ISDN system. D-channel service messages are required for D-channel backup. D-channel service messages are used to communicate changes of state of the signaling channel to in service, out of service and standby states.
Note: If backup trunks are configured, this parameter will be automatically enabled.