VOIP.MS limits each ring group to 8 subaccounts, which
seems to constrain an inbound call to ringing a max of 8
phones. However, a ring group can also have forwarding
destinations, so you could buy a random DID for 85¢
per month, put it in the main ring group and direct
its calls to a secondary ring group that contains 8
more subaccounts, for a de facto ring group of 16. And
since each ring group can have 4 forwarding destinations,
you could add 3 more groups of 8 subaccounts to the
main ring group, for a total of 40 subaccounts, serviced
by a total of 5 DIDs.
I’ve only ever needed 10 or 12 subaccounts to ring
simultaneously (using one additional DID), and this
technique works well. Theoretically, you could create
further layers to allow for way more than 40 subaccounts,
but at some quantity, I’d expect technical glitches or
objections from VOIP.MS’s staff.
For CNAM to appear on all phones, each DID would need
CNAM lookup enabled, so if you had 5 DIDs, each call
would generate 5 CNAM lookups, at a cost of 4¢ (0.8¢ x 5)
per call. But any enterprise large enough to need 40
phones to ring wouldn't sweat the DID fees or CNAM fees.
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