VoIP SIP SDK for Windows
Windows
Development environments
All versions of Windows OS, including Windows 8.1 and 64 bit systems
License Details
One time payment
No per-seat licensing
10 days fully functional trial SDK
Development Features
C#, C++, VB.NET, VB 6.0, and Delphi support
ActiveX, COM, and plain dll files
Support of SIP DLL SDK (via native dll interface)
NAT (Network Address Translation) support
Encryption on the basis of sRTP, DLS, and DTLS
DTMF (Dual Tone Multi Frequency) support
SIP Authentication
Codecs management
Log file on/off setting
Hold/Retrieve Call
Forward Call (Blind Call Transfer)
Transfer Call (Attended Transfer)
AGC (Auto gain controller) support
Adaptive silence detection
Adaptive jitter buffer
Software volume control (including Mute Sound)
Playing file into conversation
Recording conversation into file
Redirection of calls to other phone lines
Call history and address book ready
Available Codecs
H.263
H.264
G.711 (ALaw, muLaw)
G.726 (16k 24k 32k 40k)
G.729A
G.723
OPUS
iLBC
LPC-10
Speex (Narrow, Wide)
L16
RFC4733 DTMF tones
GSM
Protocols Support
SIP (Session Initiation Protocol)
RTP (Real-time Transport Protocol)
SDP (Session Description Protocol)
TCP (Transmission Control Protocol) /UDP (User Datagram Protocol)
STUN (Session Traversal Utilities for NAT)
ICE (Interactive Connectivity Establishment)
End User Features
Support of all kinds of Internet connections
Multiline support
Multiple sip accounts registration
Multi-party voice conference
SIP Registrar support (compatibility with most of SIP servers including Asterisk)
Works under firewall
IM interface
Selecting of media input and output devices
Custom ringtone support
Configuration saving and loading
Updates for Windows
Update VOIP SIP SDK for Windows
October 24, 2024
Try new features by downloading our latest update for Windows. Changes list: added ICE support to x64 version of SDK fixed crash on handling multiple call redirects fixed crash on handling hold when call not answered yet fixed playing ringtone on receiving/ending multiple calls added ability to use random RTP port numbers (set phone.Config.RtpStartPort=0)
Learn moreUpdate VOIP SIP SDK for Windows
February 13, 2024
Please download our latest update of VoIP SIP SDK for Windows. Change log: Minor adjustments and stability enhancements
Learn moreUpdate VOIP SIP SDK for Windows
December 3, 2022
Please download our latest update of VoIP SIP SDK for Windows. Change log: Redesigned playing ringtones when few incoming calls were received; Added new property ‘RingToneOnCallWaitingViaRingerDevice’ (which audio device should SDK use for playing RingTone in call waiting mode); Fixed crash on destroyed audio devices in Win11.
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ABTO Software VoIP SIP SDK for Windows provides capabilities to build a custom SIP softphone with support of multiple line voice/video calls and video conference, IM chat, multiple SIP accounts, presence, and voice mail, or add VoIP features to your custom IVR/intercom/CRM software.