Multiple Site Scenarios

More complex deployment scenario include multiple sites, shared gateways, and PBXs.

With multiple sites, the complexity of telephony deployment scenarios increases due to the following factors:

The following scenario shares telephony gateways between sites. In this example, the telephony gateway uses the PBX at site A. The telephony gateway is shared with site B, which may or may not have its own PBX. Because a single telephony gateway instead of an array of telephony gateways is installed at site A, high availability features are not supported.

Figure 1. Multiple Site Scenario Using a Shared Telephony Gateway and 1 PBX Per Site
Summary  
Sites: Multiple
Telephony Sharing: Yes
PBX Failover: No
High Availability: No

The following scenario is a variation of the previous one. An array of telephony gateways has been added, which provides redundancy, scalability, and load balancing.

Figure 2. Multiple Site Scenario Using a Shared Telephony Gateway Array and 1 PBX Per Site Multiple Site Scenario Using a Shared Telephony Gateway Array and 1 PBX Per Site
Summary  
Sites: Multiple
Telephony Gateway Sharing: Yes
PBX Failover: No
High Availability: Yes

The following scenario has a telephony gateway and PBX at each site. Using independent telephony gateways instead of sharing a telephony gateway between sites may be needed for performance and scalability. Because a single telephony gateway is installed at each site instead of an array of telephony gateways, high availability features are not supported.

Figure 3. Multiple Site Scenario Using a telephony gateway and PBX at Each Site Multiple Site Scenario Using a telephony gateway and PBX at Each Site
Summary  
Sites: Multiple
Telephony Gateway Sharing: No
PBX Failover: No
High Availability: No

The following multiple site scenario represents the best practice for high availability support. It has an array of telephony gateways and redundant PBXs at each site.

Figure 4. Multiple Site Scenario Using 2 Telephony Gateways and 2 PBXs at Each Site Multiple Site Scenario Using 2 Telephony Gateways and 2 PBXs at Each Site
Summary  
Sites: Multiple
Telephony Gateway Sharing: No
PBX Failover: Yes
High Availability: Yes

This next scenario is an option for multiple sites where one site uses Vocera Voice Server as a mission critical application, and the other site does not (perhaps because it is a small test deployment). In this example, an array of telephony gateways and two PBXs are installed at site A but not at site B. Therefore, only site A has high availability features.

Figure 5. Multiple Site Scenario with a Mission Critical Vocera System at One Site, and a Test System at Another Multiple Site Scenario with a Mission Critical Vocera System at One Site, and a Test System at Another
Summary  
Sites: Multiple
Telephony Gateway Sharing: No
PBX Failover: Yes at Site A, No at Site B
High Availability: Yes at Site A, No at Site B