Robuta

https://www.gnu.org/software/ccrtp/ ccRTP - GNU Telephony - GNU Project - Free Software Foundation free software foundation gnu telephony project https://www.gnu.org/software/commoncpp/ [u]Common C++ - GNU Telephony - GNU Project - Free Software Foundation free software foundation gnu telephony common project https://www.gnu.org/software/sipwitch/ SIP Witch - GNU Telephony - GNU Project - Free Software Foundation free software foundation gnu telephony sip witch project