3 ms·
Why is pc modem hardware so rare? I would love to use my laptop to make telephone calls directly but cannot find anything on Amazon that does this.
by dumdumchan 3y ago
Why is pc modem hardware so rare? I would love to use my laptop to make telephone calls directly but cannot find anything on Amazon that does this.
- Nextgrid 3y agoFor circuit-switched voice, 3G/4G dongles have undocumented commands to enable an audio-only virtual serial port that sends/receives raw audio data to the host (and you control the call via good old AT commands). For VoWiFi/VoLTE it's just SIP with custom auth (involving the SIM card, so you need to be able to talk to it - most modems provide a way to send/receive raw APDUs to the card) on a dedicated APN so you just need to implement support for this custom auth in any SIP client (Linphone?).