I want to allow the secretary to pick up calls from a groups of devices in a call pickup group but not vice versa.
I have CUM 7.1.3 and the phone are 7962 with an expansion module 7915.
You can configure a PickupGroup with a Partition which is reachable only from the secretary IP Phone's CSS only.
You only need one new Partition and one new CSS.
For Call group configuration just follow the below
1- Create new partition. and create new CSS -which will include the new patition
2- Make sure the call pickup group numbers does not overlap with the exiting dial plan
2- under call pickup group select the same partition on step 1.
3- Go to phone and use CSS which used on step 1.
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