No second DN is needed for regular hunt-group. The only disadvantage I've found of a DN that is in hunt group, is that you cannot monitor it via 'm' button from another phone.
Shared lines requires instead an additional DN on a separate button or in overlay.
Then, shared lines have noticeable disadvantages. First of all, when they say "shared" they mean that for real like a legacy shared line. For example, once you take a call on a shared line, if the DN is dual line, a second call will be presented only to the phone that has taken the first call.
Yes you can make the DN single line then chain via CFB to another shared line in overlay on the same button, repeat for how many calls you plan to take simultaneously.
As you can see things get kludgey quickly with shared lines, so next time a customer is adamant on the "ring them all" thing, I will produce the above mentioned TCL/IVR script.
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