Hello Raj,
I would suggest using a shared-line implementation on the phones.
For example you may have on the first button the Shared-Line of the Group (if the phone type of device that you use support 2 lines) and have on the second button the personal line of each user.
The users by selecting the line they will be able to choose by which line they will be calling and they will be always able to check the Call history of each line (either Shared or Personal).
Hope this helps,
G
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