SIP softphone with a comprehensive range of features: * ENUM dialing seamlessly checks all numbers you dial * DNS SRV lookup keeps track of which contact email addresses are active for federated SIP * TLS encryption of SIP messaging and both SRTP and ZRTP supported for audio stream encryption * ICE/STUN/TURN algorithms for NAT traversal in virtually any network (based on ice4j from Jitsi) * Push-to-talk (PTT) walkie-talkie mode allows free group chat on wifi (as long as the router supports multicast) * Built in Ganglia agent provides an enterprise-grade monitoring solution to map wifi coverage and it's relationship with call quality * Native x86 support