GNU Telephony actively promotes software freedom and human dignity in telecommunications.
The FSF supports the work of GNU
Telephony through its Working Together for Free Software fund. Please consider donating below.
GNU Free Call will let users communicate privately through each other in the event of a natural disaster.
To provide privacy, we maintain a reference implementation of the ZRTP stack, which is used by a number of free software VoIP clients. We also maintain a number of additional telephony related packages in the GNU Project including the GNU telephony audio library (ccaudio), as well as the GNU SIP Witch and Bayonne telephony servers.
Visit the GNU Telephony website.
If you'd like to pay by check or money order, you can do so by sending a check to the main Free Software Foundation address, with 'GNU Telephony' in the memo field of your check.