1) Navigate to the 'Extensions' page, and select the extension with a sidecar that needs to be updated.
2) Select the desried extension (It should be a GRP2615).
2)After selecting an extension, click the gear icon at the device option.
3) Scroll down the device options until you see 'Accessory : Grandstream GBX20'.
4) Select the '+' icon to add a sidecar.
4) Select the option “Sidecar” to start configuring the line keys for the sidecar.
5) Configure each line key. See Phone Settings & Configuration for a full description of each line key function.
6) Select 'Update Device' to save the configuration changes.
