Telephony High Availability
You can install multiple Vocera SIP Telephony Gateway
servers —also called a telephony server array—at each site.
By installing an array of telephony servers at a site, you can take advantage of the
following high availability features:
Redundancy – If one of the telephony servers stops responding, the Vocera Voice Server
automatically redirects outbound calls to another available telephony server for
Scalability – You can purchase and install as many telephony servers as you need
to increase telephony capacity.
Load balancing – For outbound calls, the Vocera Voice Server automatically allocates
calls to the least busy telephony server. The PBX equipment handles inbound load
Important: The Administration Console allows you
to specify only one telephony configuration per site. If you deploy multiple telephony
servers at one site, all of them must use the same configuration. Each telephony server
installed at a site must use the same signaling protocol and have the same capacity. You
can use telephony boards with different form factors (for example, PCI vs. PCI-X).
Generally, all telephony servers at a site will use the same PBX. However, they could use
different PBXs as long as all PBXs have the same configuration for the trunks to the
telephony servers and the same capabilities for off-PBX dialing (for example, tie lines).
Telephony servers in an array do not communicate with each other. Instead, the telephony
servers respond to requests from the Vocera Voice Server. All communication with telephony
servers is handled by the Vocera Voice Server.