[detaro]

I meant purely from a "connection to the general phone system" perspective - at all events I've been they only had internal numbers and you could be called from the outside through an extension. If there was an event where that wasn't the case I stand corrected.

Having the entire (mostly/entirely? open-source) GSM network is really really cool and important, but from the perspective of the wider phone network still "only" a "fancy internal phone system", with the limitations of control that come with that.