if you can do without the requirement of joining from any phone, this can do with multibuttons phones. Simply create dedicated dual-line DNs for the hunt group members, and assign them to additional buttons after the main DN.
Make sure you ephone-template has Hlog is seized state. This way, you will be able to select the hunt group you want to log in or out by pressing the line button before softkey. You will be then also able to set different rings for each hunt-group.
One caveat I've noticed when testing this is that the phone doesn't display selectively the hunt groups you are logged out, and it is slow to refresh state when you are again logged in all.
But, I think this is something Cisco can fix eventually.
On the other hand if all your customer wants is the ability to casually take calls from different places, perhaps a group pickup setup would work better.
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