Call Group:

The call group this extension belongs to

Example: In a way similar to context grouping, only this option sets to which call group extension belongs to. Extension can be assigned to more call groups. Use commas (1,2,3...) or dashes(1,2-7) to assign an extension to two or more call groups. Note that allowed range is 0-63.

Field Type: [0-9] [,-]

NOTE: Grouping works only within a technology(SIP to SIP or IAX to IAX).

Pickup Group:

Call groups this extension is allowed to pickup

Example: In a way similar to context grouping, only this option sets which call groups this extension is allowed  to pickup. Extension can be assigned to more call groups. Use commas (1,2,3...) or dashes(1,2-7) to assign an extension to two or more call groups. Note that allowed range is 0-63.

Field Type: [0-9] [,-]

NOTE:

Grouping works only within a technology(SIP to SIP or IAX to IAX).

If extension 1000 belongs to call group 2, and extension 1005 has pickup group set to 2; to pickup a call from ringing extension 1000, dial *8 from extension 1005. If more call group extensions are ringing at the same time dial '*88 + $EXTENSION' to pickup specific ringing extension