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From Release 7.1, Session Manager provides the client and server side support of the ping-pong based health check mechanism for SIP entities. Previously, Session Manager only provided the server side support for endpoint connections. The administrator can enable and disable ping-pong based health monitoring at the SIP Entity level with the SIP entities. Session Manager as a client generates a ping or a double Carriage Return and Line Feed (CRLF). The response to a ping is a pong or a single CRLF response. If the Session Manager does not receive a pong response, it will mark the SIP Entity as down. Session Manager waits up to 10 seconds to receive a pong in response to a ping it sent out.
By default, the ping-pong based health monitoring is disabled. When ping-pong based health monitoring is enabled, the administrator can set the ping interval between 1 and 900 seconds. The default value of the ping interval is 120 seconds. After the ping-pong based health monitoring is enabled, Session Manager can send a periodic ping at the administered level.