ts.SIPOkCheckTime

Specifies the period in seconds between the Telephony Session service’s attempts to contact a Voice Browser service instance that is marked OK. The default is 10.

When a instance is marked OK—that is, it responded to the previous OPTIONS poll or INVITE—the Telephony Session service sends another OPTIONS poll to the instance every interval to ensure it is still available. If the instance fails, the Telephony Session service marks it as failed and monitors it using the ts.SIPFailedCheckTime period instead.

Use this property in high-availability roles. If an external endpoint like a SIP gateway or proxy server generates SIP OPTIONS requests, this value must be 0, meaning do not poll. (This is the default in the non-high-availability roles.)