If you have analog lines, you do not need to do anything with DID. DIT is where you need to be. Start with Line Assignments. All your lines should be listed. There are a few tabs, one says Caller ID (setup after you get the RCIU) and the last one is DIT.

The number next to Dialing digits is the extension that the lines ring to. It could be a Multple call group (MCG) extension, or a hunt Group, or someones primary extension, or a phantom extension, r the pilot to the voicemail hunt group. This is where you would start to find out how the calls ring and where they go.

If you need to a list of all the extensions, go to Dialed number plan under System.

I have "dialed" into a voicemail even when I was onsite (due to not having a cord). It will work, but it is much slower then a direl serial connection.

Someone around here was selling a device that would allow you to connect to the voicemail through a network connection.