ABTO Software offers IVR VoIP SIP SDK – customizable interactive voice response software solution that supports multiple lines and all features of our VoIP SIP SDK:
* Support of all versions of Windows OS, including Windows 8
* Support of SIP, RTP, and SDP
* STUN and other IETF standards (compatible with SER, OpenSER and Asterisk)
* Encryption mode that accepts secure media
* Support of ActiveX, COM, and plain dll files
* Video support (H.263, H.264)
* Multiple sip accounts registration (NEW)
* Automatic selection of correct network interface (NEW)
* IVR, presence, voice mail samples (NEW)
* ICE support (NEW)
* SIP Registrar (SIP server) support
* DTMF (Dual Tone Multi Frequency)
* SIP Proxy authentication
* Support of calls: Hold/Retrieve Call, Forward Call (Blind Call Transfer), Transfer Call (Attended Transfer)
* Software volume control
* Record conversation into file
* Playback of WAV files into conversation
* IM interface
* Multi-party voice conference
* Multiline support
* Noise reduction
* Adaptive silence detection
* Mute Sound
* Support of Virtual Private Network (VPN)

Available codecs:
* H.263
* H.264
* G.711-ALaw
* G.711-muLaw
* G.726 (16k 24k 32k 40k)
* G.729A
* iLBC
* LPC-10
* Speex (Narrow, Wide)
* L16
* RFC4733 DTMF tones
* GSM