|Telephony High Availability / Telephony in a Multi-Facility Environment|
Configure the Vocera SIP Telephony Gateway to use multiple call signaling addresses to support PBX failover.
In the Web Console, navigate to Facilities in Manage section of the navigation bar. Locate your facility and scroll down to the Telephony- Basic Information configuration section in the Edit Facility page. You can select the Call Signaling Address field and enter a comma-separated list of call signaling addresses for two or more IP PBXs or VoIP gateways. At startup, Vocera SIP Telephony Gateway tries each PBX or gateway in the order specified and uses the first one that responds. If that PBX or gateway goes down, Vocera SIP Telephony Gateway switches to another one.
The VSTG uses the response to a SIP OPTIONS message to determine if the PBX or gateway is currently available. See Detecting the Connection to the IP PBX.
In some situations, using TCP as the signaling transport protocol reduces the length of time required for the VSTG to recognize that the current PBX is down and move to the next PBX in the list. see Using UDP or TCP Transport to the IP PBX.
You can override the call signaling address for a particular Vocera SIP Telephony Gateway and have it connect to a different PBX than the one used by other Vocera SIP Telephony Gateway services in the array.