TCSip is a library and daemon implementing VoIP softphone.

Features supported:

• voice calls
• encryption of voice trafic powered by SRTP
• encryption of signaling trafic powered by SSL
• X509 client certificates for both SIP and HTTPS
• history and contacts store available offline
• command line client
• operation as daemon controlled by IPC (local socket msgbuf)
• WebRTC-compatible sessions
• using ICE to pass voice trafic through NAT

Tcsip proven to work on such platforms:

• iOS
• Mac OS X
• Android
• Linux

Supported codecs

• PCMU/PCMA
• Opus
• speex