For use of the HotSwap see: https://www.comrex.com/products/hotswap/

Even though most 4G networks are marketed as unlimited, there are often charges for using too much data. Redundancy links, which run two networks simultaneously, can be expensive to run 24/7.

HotSwap is an enhancement to our CrossLock VPN Technology. It allows you to designate one network as a "backup" that will only be engaged when the primary fails. The system will warn of this status with a contact closure, and automatically fallback to the primary once its restored.

Backup STLs, dedicated links, and other mission-critical codec connections with this free feature that now ships included with all new purchases of ACCESS and BRIC-Link. Older IP audio codec models can take advantage of HotSwap by updating to firmware 4.3 or higher.

For the ACCESS line, any supported network or modem can be a backup.