Unixcop published a tutorial about installing the Kannel SMS Gateway on Debian 10 or 11.
Kannel SMS Gateway on Debian 10/11
Kannel is an open source WAP and SMS gateway for GSM networks. Moreover, Kannel can send/receive SMS using a Serial or USB GSM Modem. It is accessible via HTTP API and can be used in sending bulk SMS, OTP etc. So, Kannel has three main programs called boxes: bearerbox, smsbox, wapbox.
Kannel SMS Gateway on Debian 10/11 - Unixcop the Unix / Linux the admins deams
