Recently I got the awesome experience of integrating Unity Connection into an analog setup. While the customer does indeed use Cisco, the non-Cisco side is still in place for a few reasons and needs to continue to work. Their old Unity box was decommissioned but then brought back on. When the phones received calls, they would send the voicemail to the Unity Connection box as you would expect. The problem is, the old Unity box was still for some reason triggering when the messages button would be pressed on the non-cisco phones.
After poking around a bit I found they have a DMG or Digital Media Gateway. This had routes to Unity Connection but was listed second in the top down list. The first thing to fix was this and get rid of the Unity route completely. The issue is, being unfamiliar with the DMG, I was rolling the dice. The configuration menus were not too difficult to figure out but I still didn't full understand everything. It turns out however, my solution was correct.
The next stop was to make PIMG ports on the Unity Connection box. This will allow the analog phones to get their MWI and access their voicemail on demand when pressed. Now the only thing I still don't fully understand in the first place is how the Unity Connection was being used by the DMG as voicemails were being delivered there somehow without the PIMG ports. My guess is that it hit a route elsewhere when it got sent to the Cisco side. However, being on a time schedule to getting something fixed since it was paid per hour, I didn't have too much time to try to figure that aspect out.
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