Developer's DescriptionBy AsteriskguruMake VoIP calls using SIP and IAX/IAX2 phone dialer compatible with Asterisk.IDEFISK 2.0 Free SIP and IAX / IAX2 phone is a user-friendly softphone, compatible with Asterisk or any other SIP or IAX capable system, offering high-quality VoIP calling experience. NEW features include: SIP + IAX/IAX 2 protocols, STUN support, STUN server per account, Echo cancellation, DTMF tones sending, Support for multiple audio devices, Automatic user registration, Call transfer, Hold function, Codecs: GSM, ulaw, alaw, speex, ilbc.Version 2 includes SIP + IAX/IAX 2 protocols, STUN support, STUN server per account, Echo cancellation, DTMF tones sending, Support for multiple audio devices, Automatic user registration, Call transfer, Hold function, Codecs: GSM, ulaw, alaw, speex, ilbc.