Zoom Phone Local Survivability

ZPLS is an on-premises virtual appliance that can connect internal phone calls between users in a common Site when Zoom data centers are unreachable

The ZPLS module is an on-premises appliance that allows users within the same Site, connected by a common network, to place phone calls to each other when Zoom data centers are unreachable. This creates a survivability solution for business continuity in the event of a network outage or your network disconnects from Zoom Phone data centers.

Example diagram of ZPLS in a single Site Design while Zoom Phone is inaccessible.

ZPLS also supports cross-Site calling when ZPLS appliances for each Site are connected to a common network

On its own, a ZPLS module provides survivability to users within a common Zoom Phone Site. However, multiple ZPLS modules connected through a local, campus, or wide-area network can support cross-Site communication, connecting users from different Sites during a survivability event so long as the internal network remains operational.

Example diagram of ZPLS in a multi-Site Design while Zoom Phone is inaccessible.

Customers can integrate ZPLS with an SBC to make and receive PSTN calls when Zoom data centers are unreachable

Customers can integrate the ZPLS module with a session border controller (SBC) for external public switched telephone network (PSTN) connectivity when Zoom data centers are unreachable. This allows users with PSTN numbers provided by Zoom or third-party BYOC carriers to receive inbound calls from external parties when call forwarding for survivability is enabled in the cloud, and to place external phone calls regardless of local network conditions or Zoom data center availability.

Example diagram of ZPLS in a multi-Site Design with a PSTN while Zoom Phone is inaccessible.

ZPLS supports Survivability Distribution Groups, providing nuanced call routing capabilities during a survivability event

ZPLS modules support Survivability Distribution Groups (SDGs) for nuanced call-routing configurations during a survivability event. With SDGs, a business can route internal and inbound PSTN calls to an individual user, a group of users (similar to a Call Queue or shared group), an IVR menu, another phone number, or, if necessary, another SDG.

Although SDGs do not provide the same full-featured functionality as standard-operation Call Queues, shared line groups, or Auto Receptionists, SDGs can continue to support a business’ critical call routing needs until normal operations are restored.

Overview Diagram

The following diagram demonstrates the network ports and data flows used with a ZPLS module and an SBC configuration.

Diagram containing network ports and data flows used within a ZPLS model and an SBC configuration.

Refer to Zoom’s support center for more information on Zoom Phone Local Survivability.