Comment by mnutt

My son _loves_ the train status aspect and I'm happy to oblige as it gives me an excuse to hack, but as other people point out you can get a lot of mileage out of even just getting a landline. Or you could probably connect the Grandstream directly to Twilio or another low-cost VoIP provider for cheaper than a land line and keep the ability to limit which phone numbers can be used.

The project was delayed for a day for lack of a phone cable. (of all of the weird old cables I have somehow rj-11 is no longer one of them...) I considered buying one off Amazon but it felt incredibly wasteful, so instead I asked our IT department at work. Almost any office will have piles of these things sitting around collecting dust.