Check if they belong on the same group also make sure on your Call Pickup Group Information Configuration the Call Pickup Group Number should be a unique number .The Call Pickup Group Number is kind of like a route point and should not be the same number as a DN.
You can try re-create the Pickup Group and reset the Phone
Example Scenarios/procedure
How to Pick Up Calls Within Your Own Group
Call Pickup allows you to pick up incoming calls within your own group. In this case, a group is any organization of Cisco IP Phone extensions, as defined by you
When an incoming call is received on an extension that belongs to the same group as that of your Cisco IP phone, follow these steps to answer that call:
Go off-hook on any line that has a Call Pickup group associated with it.
Press the More softkey and then the Pickup softkey.
Press the Answer softkey.
How to Pick Up Calls that Belong to Another Group
Group Call Pickup allows you to answer incoming calls that ring on a Cisco IP phone that belongs to a pickup group other than your own. To use this feature you must know the pickup group number to which the ringing phone belongs.
When an incoming call is received on an extension that belongs to a different group than that of your IP phone, follow these steps to answer that call:
Go off-hook on any available line appearance.
Press the More softkey and then the GPickup softkey.
Dial the Group Call Pickup number.
Press the Answer softkey.
Check the Call Pickup Group documentation to further detaisl
Cheers
Bruno Rangel
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