Grandstream UCM6100 User Manual for 1.0.9.25 - Manual (Page 209)

Firmware Version 1.0.9.25 UCM6100 Series IP PBX User Manual Page 208 of 303
USING EXTENSION GROUPS
Here is an example where the extension group can be used. Go to Web GUI->PBX->Basic/Call
Routes->Outbound Routes and select "Enable Filter on Source Caller ID". Both single extensions and
extension groups will show up for users to select.
Figure 121: Select Extension Group in Outbound Route