(Optional) Integrate ZPLS with PSTN

This section provides step-by-step instructions for integrating an SBC with the ZPLS module for PSTN connectivity during survivability events. This process is not required for customers that do not plan to integrate their ZPLS module with an SBC. However, customers that do plan on integrating are encouraged to complete this process as soon as possible, prior to any outage occurring.

Install Zoom’s Certificates on your SBC

To establish a survivability PSTN connection, a SIP trunk must be established between your site’s SBC and the ZPLS module. Prior to beginning this process, the SBC musthave Zoom’s Digicert root and intermediate certificates installed.

Configure the SBC for Premises Peering (BYOC Setup)

Confirm your SBC meets minimum requirements and is configured for BYOC premises peering.

Add an SBC to a Site

To begin the PSTN integration process, an SBC must be added to the web portal and associated with the account or a specific site. To add an SBC to your account, perform the following steps:

1. Sign into the Zoom web portal.

2. Under the Phone System Management sub-menu, select Company Info.

3. Select the site name from the list (or click Account Settings if a single-site configuration).

4. Select the site’s Settings tab.

   
5. Locate the Routing subsection, and the setting for Session Border Controllers. Click Manage to load a new page.

   
6. On the new page, click the blue Add button in the top-left corner to add an SBC.

7. On the following page, populate the following fields:

   1. Display Name describes the SBC being added.

   2. Enter a Public IP and Port Number for the SBC. This should be the public IPv4 address assigned to the SBC and is used to establish a SIP trunk from the cloud.

   3. Enter a Survivability Public/Private Address and Port Number. This is used to establish a SIP trunk between the ZPLS module and the SBC.

Zoom strongly recommends using a private IPv4 address for the above value. A private value can avoid routing unnecessary traffic through the firewall, which may otherwise require complex route reflection rules.

1. Continue populating the fields:

   1. Toggle the In Service switch to mark the SBC as capable for use.

   2. Enable Integrate an on-premises PBXto ensure BYOC numbers can be routed through the cloud under normal operating conditions.

   3. Enable Send OPTIONS ping messages to allow account administrators to verify SBC connectivity between the ZPLS module and Zoom Phone cloud.

   4. Click Save to complete.

Configure a Route Group

Each phone site (or account for single-site deployments) requires two route groups to ensure PSTN connectivity is functional with the ZPLS module.

1. A BYOC route group is required to create a SIP trunk between a Zoom Phone SIP zone and each site’s SBC. When configured, this SIP trunk directs inbound calls made to a BYOC number to the local site during routine (non-survivability) operations.

2. A survivability route group is required for each phone site to direct outbound calls from the ZPLS module to the SBC.

BYOC Route Group

To create a BYOC route group between your SBC and Zoom Phone data centers, perform the following steps:

1. Sign into the Zoom web portal.

2. Under the Phone System Management sub-menu, select Company Info.

3. Select the site name from the list (or click Account Settings if a single-site configuration).

4. Select the site’s Settings tab.

   
5. Locate the Routing subsection, and the setting for Route Groups. Click Manage to load a new page.

   
6. On the following page, click the blue Add button in the top-left corner and a pop-up will appear.

7. Within the pop-up, enter a Display Name for the route group and select the Region closest to the geographical location of the ZPLS module. Distribution should be set to Sequential.

   
8. Select the Session Border Controller added in the previous section.

9. Click Save.

Survivability Route Group

To create the survivability route group and route outbound calls from the ZPLS module to the SBC, perform the following steps:

1. Repeat steps 1-6 from the previous section.

2. Within the pop-up, enter a Display Name for the route group.

   
3. Change the Type to Survivability.

4. Select the Session Border Controller added in the previous section.

5. Click Save.

Assign the Survivability Route Group to the ZPLS Module

After the survivability route group is created, it must be assigned to the ZPLS module. To assign the route group, perform the following steps:

1. Under the Phone System Management sub-menu, select Company Info.

2. Click Account Settings in the top-left corner.

1. On the following screen, locate the Zoom Node subsection, and the setting for Local Survivability. Click Manage to load a new page.

1. Locate the server to be assigned, click Assign to or Edit, and a pop-up will appear.

2. Within the pop-up, fill in the Assign To fields with the intended site and route group created in the previous section.

   

The site for this module may have been previously filled out during the Associate the ZPLS Module with a Site process. If so, click the ellipses box (...) and click Edit. Re-select the Site and choose the appropriate Route Group.

1. Click OK when complete to finish.

After completion, the ZPLS module for the site will attempt to establish a TLS connection with the site’s SBC. If the OPTIONS ping is enabled, routine OPTIONS pings will transmit between the two devices for verification and troubleshooting purposes.