pjsua-2.16

pjsua is an open source command line SIP user agent that is used as the reference implementation for PJSIP and PJMEDIA. It has many features, such as: * Multiple identities/account registrations * Concurrent calls and conference (unlimited number, but only up to 254 sources can be mixed to a single destination) * Call features: call hold, call transfer (attended or unattended, with or without refersub). * SIP Presence/SIMPLE with PIDF and XPIDF support. PUBLISH support. * Instant messaging and message composing indication * DTMF digits transmission/receipt (RFC 2833) * WAV file playing, streaming, and recording. * Accoustic echo cancellation (AEC). * Auto-answer, auto-play file, auto-loop RTP * Support SIP UDP, TCP, and TLS transports. Support for DNS SRV resolution. * NAT traversal with rport and STUN. * Tone generation. * Codecs: PCMA, PCMU, GSM, Speex (including wideband/16KHz and ultra-wideband/32KHz), L16 (8-48KHz, mono or stereo), and iLBC. * Adaptive jitter buffer, adaptive silence detection, and packet lost concealment audio features.