The B-Timer is the maximum amount of time that the Orchestrator will wait for a provisional response to a SIP Invite message (i.e. a SIP 18x response). An extension of Max PDD, the B-Timer moves a call to the next trunk or trunk group (termination calls only) when no provisional response is received from the customer or vendor. The B-Timer starts when the SIP Invite is sent to the outgoing Termination Vendor or Origination Customer trunk and expires when there is no SIP 18X response within the configured time. If the B-Timer expires, the call rolls over to the next Trunk or Trunk Group if available.
The B-Timer value must be:
between 1-10 seconds
smaller than the Max PDD value.
If the B-timer field is empty, then it will not be used to route advance to another trunk or trunk group.
Example
Set PDD to 10 seconds and B Timer to 3 seconds.
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