Screen capture below displays how to enable the IMG so that if an SS7 link goes Out Of Service that the associated CIC's stay in service either a set amount of time (2 minutes), or till certain conditions are met. Screen capture below was taken from IMG set up as an E1 box (ITU). The procedure is the same for T1 (ANSI).
Note: Feature F-5134 SS7 Link Out Of Service was added to software 10.5.2_ER3 only. The feature was not added to any other build until 10.5.3_ER1. From there, all subsequent builds after 10.5.3_ER1 will have the feature in it.
Disable (Default) - Functionality is same as previous software.
On loss of signaling accessibility:
Enable:
On loss of signaling accessibility:
Associated CICs in the connected state remain in service.
Associated CICs in the inbound ringing state remain in service.
All other CICs are immediately brought out of service.
During the loss of signaling accessibility:
Calls released from the remote call leg are brought out of service.
A 2 minute timer is running, if this timer expires all associated CICs not already out of service are then brought out of service (purge).
On restore of signaling accessibility:
All associated CICs not already out of service are then brought out of service (purge).
All associated CICs are then returned to service.