I'm sure I am not using the correct terminology. We use a DCS 50si, for the life of me I can not remember how to “activate” a station number. I am trying to take a voice mail number “261” and enable it to be used as an extension/station number. I have a Prostar programming manual and it says to use MMC 317. In this system that says “invalid data” when I try.

Thanks

If you want to add 261 as an extension on the phone system then you need to add it in mmc 724.

I think I figured that out. Thanks. Is there a way to print out a "map" of the features that are already programmed in this system? Or directory that is set up?? Trying to figure what has been set up in the system.

You can download and look at the phone side programming using pcmmc if the system has a misc card.
You will need a serial port and the correct version of pcmmc that relates to the systems software version.It is old dos based program.