Session Manager can have one of the following Service States:

• Accept New Service: In this state, Session Manager accepts incoming calls.

  When Session Manager is in Accept New Service state, Avaya Aura® Device Services contact services works uninterrupted.

• Deny New Service: In this state, Session Manager denies any new call attempts and service requests.

  When Session Manager is in Deny New Service state, Avaya Aura® Device Services Contact Services do not work. Avaya Aura® Device Services is also placed in Deny New Service state and sends an HTTP/503 error for all add, update, and delete requests for contact service.

• Maintenance Mode: In this state, Session Manager is placed in a dormant state for maintenance.

  When Session Manager is in Maintenance state, Avaya Aura® Device Services Contact Services do not work. Avaya Aura® Device Services is also placed in Maintenance state and sends an HTTP/503 error for all add, update, and delete requests for contact service.