ts.SIPFailedCheckTime

Specifies the interval in seconds between the Telephony Session service’s attempts to contact a Voice Browser service instance that has failed. The default is 30.

When a Voice Browser service instance has failed—that is, it did not respond to the previous OPTIONS poll or INVITE—the Telephony Session service sends another OPTIONS poll to the instance every interval until the instance responds. Once the instance responds, the Telephony Session service monitors it using the ts.SIPOkCheckTime 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.)