https://gitlab.synchro.net/main/sbbs/-/issues/376#note_2468
It already supports modem/phone numbers:
```
Editing Service List
1 vert.synchro.net telnet
2 vert.synchro.net ssh
3 vert.synchro.net telnet
4 vert.synchro.net telnet
5 bbs.synchro.net telnet
6 bbs.synchro.net rlogin
7 cvs.synchro.net telnet
Which, Add, Insert, Delete or Quit: A
Adding Service
Terminal service host name, IP address (excluding port number), or phone number Address: 714-529-9999
TCP protocol name (e.g. telnet, ssh, rlogin) or 'modem' for traditional dial-up Protocol: modem
TCP Port number, if non-standard
Port:
Minimum connection bit-rate (for dial-up modem)
Min_rate: 2400
Maximum connection bit-rate (for dial-up modem)
Max_rate: 33600
Service/modem description (optional)
Description: HST/V.32bis
```
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