Cactus 1.04
Cactus is a software-based private branch exchange (PBX) for Voice over IP telephones.
It runs on any Windows PC with a network adapter and also implements a VoIP-ISDN gateway if an optional ISDN card is plugged into the PC. Cactus is SIP compliant and avoids external IP traffic for internal telephone conversation. For external calls, all SIP-based providers like SipGate can be used.
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