ASAI Maintenance Capabilities
Protocol Error (NAK) Cause(s)
None for this capability
Considerations
If the adjunct does not acknowledge a Heartbeat request after sending Resume Alarms, the ECS restarts the link and generates an alarm, if alarms are administered.
Restart and Link Versions
Restart provides that either endpoint may use this feature to free and reinitialize all resources for an ASAI interface. It also insures that if one ASAI endpoint detects a layer 2 drop [and therefore clears all its CRVs (for example, association) for the interface], ASAI messaging cannot continue on that interface without the other endpoint clearing its CRVs also.
Both the ECS and the adjunct initiate the Restart when:
■An ASAI layer 2 link has been
■An ECS or adjunct maintenance subsystem determines a need to restart the ASAI interface.
Link Versions allow an adjunct to negotiate for a specific version of ASAI, as long as the ECS supports that version. Release 5 supports three versions of ASAI: version 1, version 2, and version 3.
If a large number of associations are active on the ECS, then the ECS may need additional time to complete the restart. In this case, the ECS will not acknowledge (ACK) a received Restart, but will instead send a restart of its own when the data is initialized and the ECS is ready to bring up the link.
The versions and link restart procedures are covered in the DEFINITY Enterprise Communications Server CallVisor ASAI Protocol Reference,
Information Flow
This section applies to both the ASAI ISDN BRI and Ethernet links. With ASAI Versions, the ECS sends a RESTART message to the adjunct containing the ASAI version(s) offered on the ECS (currently V1, V2 or V3). The adjunct responds to the ECS’s RESTART message with a Restart Acknowledgement message that includes the ASAI version of choice for that adjunct. If the ECS does not support that version, the ECS sends a RESTART message with a list of the available versions. If the adjunct sends a REstart Acknowledgement message back with no version, the link is initialized with default version 1. If the adjunct
