Page 631 of 1814International ISDN PRI Feature description and administration636Error Handling on ISDN Signaling LinkAnalog E&M TIE TrunksContentsThe following are the topics in this section:Feature description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 631Operating parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632Feature interactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632Feature packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632Feature implementation . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 633Task summary list . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 633Feature operation . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 633Feature descriptionThe Integrated Services Digital Network Signaling Link (ISL) Analog E&MTIE Trunks feature identifies error conditions that are generated by externalequipment and ensures that faulty trunks cannot be used. When the errorcondition is removed, the trunk is put back into service.When an error condition is identified while the trunk is idle, the trunk is putinto a maintenance busy mode and a trunk error message is printed. If an erroroccurs while a call is being sent, an error message is printed and the callproceeds; the trunk unit is put into maintenance busy mode after the call isdisconnected. Outgoing calls cannot be made on units that are in maintenancebusy and incoming calls are rejected.
