4 ms·

Sorry for the useless nitpick but it's not so much about working place per se but rather about internal switchboard; although it usually is linked. I once rente

by nolok 8y ago

Sorry for the useless nitpick but it's not so much about working place per se but rather about internal switchboard; although it usually is linked. I once rented a place here in France that was a former student building, while it was a normal apartment renting on paper/legally/technically, I still had to dial a number to reach the outside world. Fun times when your old neighbor transfer calls to you without wanting to.

topbanana 8y ago
That reminds me. In our student building there was an intercom on each building, and 7 or 8 students would share each apartment. I noticed that it would quietly dial the internal number for that apartment. Sure enough, dialing 9 with a DTMF tone generator would get an outside line :)
- closeparen 8y ago
  Use that to dial your own cell phone, then press any key on your cell phone to unlock the door.
derefr 8y ago
It's kind of silly; you can very easily set a PBX into a mode where any registered user handset will dial out by default, and can't use the PBX features like forwarding (but circuits created by the PBX's internal logic still can, so you don't lose features like ring pools for font-gate access.)
- netsharc 8y ago
  Now you make me curious, what do you think, is NASA's internal phone system an antiquated hack from the 1970's (which one site tells me when PABX was introduced), with old admins swearing every day that management never cared about upgrading it? NASA was formed in the 60's, it makes me wonder what other ancient still-running tech they have there...
  - derefr 8y ago
    Nah, I'd bet that the ISS is using the very most modern tech (i.e. they're probably just forwarding a regular DTLS SIP connection to a Houston Asterisk server over a shared https://www.nasa.gov/content/dtn https://www.nasa.gov/content/dtn carrier downlink.) The ISS is designed in an extremely modular fashion; upgrading the routers in space (or any other non-essential module) is a matter of a few minutes' latching and hot-plugging. Mind you, NASA probably can't get rid of their older tech on the ground, since there's older missions (whether in space, or just still within the mission lifetime for logistical support if re-deployment was desired) that still rely on it. But NASA is the #1 organization in the world for big-S Systems Engineering: they know how to do hybrid deployments, live migrations, etc. The existence of a legacy peer, to NASA, isn't a constraint on new builds of local components; it's rather a stable wire protocol to build compatible emulations of, and then extend with new features to produce a new wire protocol that new ground and remote hardware can speak. --- Regarding the dial-9 thing, though: the ISS probably has many good uses for the internal-by-default dialing scheme. I could imagine that they make all sorts of conference calls, for one thing.

by nolok 8y ago

topbanana 8y ago

That reminds me. In our student building there was an intercom on each building, and 7 or 8 students would share each apartment. I noticed that it would quietly dial the internal number for that apartment. Sure enough, dialing 9 with a DTMF tone generator would get an outside line :)

closeparen 8y ago
Use that to dial your own cell phone, then press any key on your cell phone to unlock the door.

derefr 8y ago

It's kind of silly; you can very easily set a PBX into a mode where any registered user handset will dial out by default, and can't use the PBX features like forwarding (but circuits created by the PBX's internal logic still can, so you don't lose features like ring pools for font-gate access.)

netsharc 8y ago
Now you make me curious, what do you think, is NASA's internal phone system an antiquated hack from the 1970's (which one site tells me when PABX was introduced), with old admins swearing every day that management never cared about upgrading it? NASA was formed in the 60's, it makes me wonder what other ancient still-running tech they have there...
- derefr 8y ago
  Nah, I'd bet that the ISS is using the very most modern tech (i.e. they're probably just forwarding a regular DTLS SIP connection to a Houston Asterisk server over a shared https://www.nasa.gov/content/dtn https://www.nasa.gov/content/dtn carrier downlink.) The ISS is designed in an extremely modular fashion; upgrading the routers in space (or any other non-essential module) is a matter of a few minutes' latching and hot-plugging. Mind you, NASA probably can't get rid of their older tech on the ground, since there's older missions (whether in space, or just still within the mission lifetime for logistical support if re-deployment was desired) that still rely on it. But NASA is the #1 organization in the world for big-S Systems Engineering: they know how to do hybrid deployments, live migrations, etc. The existence of a legacy peer, to NASA, isn't a constraint on new builds of local components; it's rather a stable wire protocol to build compatible emulations of, and then extend with new features to produce a new wire protocol that new ground and remote hardware can speak. --- Regarding the dial-9 thing, though: the ISS probably has many good uses for the internal-by-default dialing scheme. I could imagine that they make all sorts of conference calls, for one thing.