|Telephony High Availability / Telephony in a Multi-Facility Environment|
In a multiple facility environment, the Vocera Platform Voice Service uses the Dialed Number Identification Service (DNIS) to determine which facility's hunt group number was called and thus which facility's grammars to use for the call.
With additional PBX configuration or utilizing the advanced routing features possibly offered by your central office, your inbound calls are routed automatically to the PBX at a different facility when one of your telephony service set ups go down.
The following describes the call flow scenario illustrated in the figure:
Someone places a call to a Vocera device user at Facility A.
The Central Office routes the call to Facility A based on the called number.
The VSTG at Facility A is down, so the call is routed back to the Central Office.
The Central Office routes the call to another PBX at a different facility using an alternate routing plan.
The call is received by the Voice Service, which knows which facility's grammars to use based on the dialed number.
The badge user at Facility A receives the call.
If a call made to a facility is rejected by the initial PBX for any reason (for example, the VSTG may not be responding), the call can be routed by the Central Office to another PBX at a different facility using an alternate routing plan. When the call arrives at the telephony service at the other facility, it sends the call to the Voice Service. The Voice Service knows which facility's grammars to use based on the dialed number.