Grandstream Networks UCM6510 - Use Extension Groups; Figure 97: Select Extension Group in Outbound Route

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UCM6510 IP PBX User Manual
Version 1.0.20.31
Use Extension Groups
Here is an example where the extension group can be used. Go to Web GUI  Extension/Trunk 
Outbound Routes and select "Enable Filter on Source Caller ID". Both single extensions and extension
groups will show up for users to select.
Figure 97: Select Extension Group in Outbound Route