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PhilTel ☎️

Hi, we're a group called PhilTel aiming to install free-to-use in . We are having an install party at @iffybooks on December 17th where we will install our first phone (more info here, iffybooks.net/event/philtel-fr)!

We will also be distributing a zine that explains the project and some of the interesting things you can do with the phone.

For more info, check out philtel.org

A hardhat with a label "PHILTEL" on it over the open, bottom-half of a payphone. To the right of it is a circuit board and the top half of a payphone. All on a concrete floor.
A red square circuit board centered in the black, back-side of a top payphone housing. Wires go from the board to a handset connector and small ringer board with a speaker. Metal latches and bolts surround the board.
An open gray demarcation box on a brown carpet. On the left side of the box is a TMobile cellular modem to the left of a battery pack. On the right side of the box is an analog telephone adapter above a small square router. An orange ethernet cord goes between the router and adapter. Wires go between all the components and the battery. A telephone wire connects to the adapter and exits the box at the bottom.
A payphone in the background and a blue-box device in the foreground. The blue-box has a rectangular translucent-white case with black keypad and blue lcd screen. An audio cable goes from the box to a small speaker placed in the mouthpiece of the payphone's black handset.
#introduction
Dec 01, 2022, 02:17 PM·Public
92boosts·128favorites
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Aphrodite ☑️ :boost_ok:

@philtel @iffybooks

oh no
#shadytel has competition that actually is about customer service

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rtn

@philtel Have you had any problems with outgoing voice on an incoming call? Whenever I call out the outgoing voice works well. I suspect there's some connection issues with RTP but not sure.

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PhilTel ☎️

@rtn We did have one-way audio issues, though I forget which party was affected. It turns out that there is a range of ports that RTP was trying to use that were locked down on the server. If you are running asterisk with the sip logger on you can see the connection fail in real-time. I couldn't get consensus on the actual port range to open or if you can restrict it from asterisk but since we are on a VPN I could open things up pretty well. We haven't had an issue since.

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rtn

@philtel Ah. Currently I'm connecting to the sip server provided by eventphone.de while getting started. I should probably try out Asterix and have a custom VPN as well. Thanks for input.

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Todd

@philtel @iffybooks
I'm excited for the next iteration, rotary dial, operator assisted payphones!

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Killab33z O.G. :hispagatos:

@philtel @iffybooks this is amazing! ^_^

Any open specs so we can implement this in other places around the world?

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PhilTel ☎️

@Killab33z_OG Yes! Everything we have internally documented already is also available on our website: philtel.org/blog We do still need to write up something about the asterisk config and ATA config, though many of the techniques we use are pretty boilerplate. Hell, you can even connect an ATA directly up to a VoIP provider and bypass asterisk for a simpler setup and have an analog phone online through it in 15 minutes.

philtelBlogBuilding an amateur payphone network in Philadelphia.
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