For the time being, we're back to singles.... Here's why...
We use Asterisk strictly for voicemail. It has a buitl in notification engine which is reliable and works well...very tightly integrated.
With the multiples, we had a PHP script which was collecting info from Asterisk and handling the notifications. The new developers did not feel this could scale well and wasn't stable enough.
So we're back to using the proven method for notifications...which only supports single without spending a week or so writing C code to add the functionality. We'll do this a little later, but for now, it's not a huge priority.
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