The problem with implementing a feature like this is that the outbound routes typically send an invite with the number to be "dialed" and do not easily add DTMF sequences after the call is connected. In other words, when you dial 9-1-9-5-5-5-1-2-1-2 on your ATA, you dial the discrete DTMF tones, but the ATA doesn't send anything until it matches a dial pattern (it simply sends an invite to "9195551212" at the media gateway. It doesn't "hold back" digits to be sent as DTMF tones later.
For some reason I thought Voipo was going to have 123 as the primary VM access number and 124 as a number that would prompt you for a mailbox number... I have to say, though, I like the thought of assigning a "Voicemail Access Number" per voicemail box.
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