VoIP SIP SDK
High performance VoIP SDK for .Net developers
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Download documentation
Data Sheet (.pdf)
API documentation (chm)

Voice softphone examples
C# examples
Customizable C# softphone
Windows Forms Softphone
Simple Softphone for voice calls
Call forward and transfer example
Call holding example
Auto answering softphone example
SIP/SDP message manipulation
Do Not Disturb example
.mp3 and .wav handling example
Softphone with multiple phone line support
Softphone for call recording
Softphone for blind transfer
Softphone for multiple calls
Softphone for conference calls
Visual C++.Net Example
Visual C++.Net softphone
VB.Net Example
VB.Net softphone Example

Video softphone examples
Simple C# videophone
Codec and resolution changing

Webphone examples
Silverlight examples
Video chat example
Easy connection example
Mediagateway SIP example
Web to SIP calls
Web to web voice calls
Web to web video calls
Javascript webphone integration
Flash Examples
Flash SIP example
Flash Chat example
Web to SIP calls
Web to web voice calls
Web to web video calls
Javascript webphone integration
Web conference example

IVR examples
C# Examples
Simple DTMF IVR
Voice recognition IVR
Windows Forms DTMF IVR
XML based DTMF IVR
XML based Voice recognition IVR
VB.NET Example
XML based DTMF IVR IVR

Call center examples
Voice Activation Detection
Predictive dialer

Ozeki VoIP Training
Softphone development
Answering machine development

Further example programs
C# examples
Autodialer
Speech to text example
Voice conference room
Command line caller
SIP SMS example
Callback form
Voice recognition
Audio conversion example
ASP example
Asp VoIP example
OZEKI VoIP SDK - Product Guide

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Ozeki VoIP SDK


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Ozeki VoIP SIP SDK for Windows 8, Windows 7, Windows Vista, Windows 200x, Windows XP
Name:Ozeki VoIP SIP SDK v10.0.0
Updated: 2012.05.11.
Download:VoIP_SDK-10.0.0.zip (82.0 MB)
Changes:
  1. New feature: You can create custom PBX. Many examples included.
  2. Silverlight video stream quality highly improved.
Name:Ozeki VoIP SIP SDK v9.8.0
Updated: 2012.04.27.
Download:VoIP_SDK-9.8.0.zip (74.4 MB)
Changes:
  1. Trial time calculation fixed.
  2. SetKeepalive method was removed from ISoftPhone.
  3. VoIP SDK is compatible with voipgateway.org.
Name:Ozeki VoIP SIP SDK v9.7.0
Updated: 2012.04.13.
Download:VoIP_SDK-9.7.0.zip (74.3 MB)
Changes:
  1. DTMF event player has changed. You can play dtmf sound anytime(call is not required).
  2. Trial version limitation reduced: You can create unlimited simultaneous phone calls and phone lines.
  3. Incoming calls will not be rejected because of the licensing.
Name:Ozeki VoIP SIP SDK v9.6.0
Updated: 2012.04.02.
Download:VoIP_SDK-9.6.0.zip (73.9 MB)
Changes:
  1. New feature: You can add custom phone number, display name in the phone call.
  2. Improvement in LicenseManager.
  3. Improvement in call forwarding.
Name:Ozeki VoIP SIP SDK v9.5.0
Updated: 2012.03.14.
Download:VoIP_SDK-9.5.0.zip (73.4 MB)
Changes:
  1. New feature: TLS support.
  2. New feature: attended transfer.
  3. Improvement in Avaya connectivity.
Name:Ozeki VoIP SIP SDK v9.4.0
Updated: 2012.02.24.
Download:VoIP_SDK-9.4.0.zip (66.6 MB)
Changes:
  1. New feature: SRTP.
  2. New feature: blind transfer.
  3. New video codec: H.263.
Name:Ozeki VoIP SIP SDK v9.3.0
Updated: 2012.02.10.
Download:VoIP_SDK-9.3.0.zip (64.8 MB)
Changes:
  1. New audio codecs:
    • L16
    • G723
    • G726-16
    • G726-24
    • G726-32
    • G726-40
    • G728
  2. Improvement in echo cancellation.
Name:Ozeki VoIP SIP SDK v9.2.0
Updated: 2012.02.02.
Download:VoIP_SDK-9.2.0.zip (54.2 MB)
Changes:
  1. Webphone development support (Flash and Silverlight).
  2. Improvement in silence filter.
  3. Minor bug fixes.
Name:Ozeki VoIP SIP SDK v9.1.0
Updated: 2012.01.27.
Download:VoIP_SDK-9.1.0.zip (41.9 MB)
Changes:
  1. New feature: Answering machine detection.
  2. Improvement in Voice Activity Detection.
  3. Minor bug fixes.
Name:Ozeki VoIP SIP SDK v9.0.0
Updated: 2012.01.16.
Download:VoIP_SDK-9.0.0.zip (32.9 MB)
Changes:
  1. New feature: Video calls are supported effectively from this version.
    Available video codecs:
    • H.263+
    • H.264
Name:Ozeki VoIP SIP SDK v8.9.0
Updated: 2011.11.29.
Download:VoIP_SDK-8.9.0.zip (15.4 MB)
Changes:
  1. Improvement in Avaya connectivity.
  2. Improvement in the sample programs.
Name:Ozeki VoIP SIP SDK v8.8.0
Updated: 2011.11.24.
Download:VoIP_SDK-8.8.0.zip (12.2 MB)
Changes:
  1. Improvement in registration.
  2. Improvement in microphone handling.
  3. Improvement in the Demo Softphone.
  4. Improvement in JitterBuffer.
  5. Improvement in VoiceIVR sample program.
  6. Improvement in DtmfEventWavePlayer (clearer voice and faster operation).
Name:Ozeki VoIP SIP SDK v8.7.0
Updated: 2011.10.27.
Download:VoIP_SDK-8.7.0.zip (16.6 MB)
Changes:
  1. Improvement in TCP/SIP connection.
  2. Bug fix: In some cases the SDK freezes during NAT detection. This bug has been fixed.
Name:Ozeki VoIP SIP SDK v8.6.0
Updated: 2011.10.25.
Download:VoIP_SDK-8.6.0.zip (16.6 MB)
Changes:
  1. Improvement in sound quality.
  2. Improvement in the manipulation of SDP messages.
Name:Ozeki VoIP SIP SDK v8.5.0
Updated: 2011.10.07.
Download:VoIP_SDK-8.5.0.zip (16.6 MB)
Changes:
  1. Improvement in Skype connectivity regarding receiving calls.
  2. Improvement in stability.
Name:Ozeki VoIP SIP SDK v8.4.0
Updated: 2011.09.23.
Download:VoIP_SDK-8.4.0.zip (16.5 MB)
Changes:
  1. Skype connectivity has been further improved.
  2. Improvement in stability.
  3. Improvement in sample programs.
Name:Ozeki VoIP SIP SDK v8.3.0
Updated: 2011.09.13.
Download:VoIP_SDK-8.3.0.zip (16.5 MB)
Changes:
  1. Improvement has been made in hang up function for greater efficiency.
  2. Improvement in documentation.
Name:Ozeki VoIP SIP SDK v8.2.2
Updated: 2011.09.08.
Download:VoIP_SDK-8.2.2.zip (16.5 MB)
Changes:
  1. This release of Ozeki SIP SDK ensures higher stability in connections.
  2. Improvement has been made in hang up function.
Name:Ozeki VoIP SIP SDK v8.2.1
Updated: 2011.08.26.
Download:VoIP_SDK-8.2.1.zip (16.2 MB)
Changes:
  1. Improvement in re-registration.
  2. Improvement in connection stability.
  3. Improvement in memory usage.
Name:Ozeki VoIP SIP SDK v8.2.0
Updated: 2011.08.22.
Download:VoIP_SDK-8.2.0.zip (16.2 MB)
Changes:
  1. Improvement in the stability of connection.
  2. Improvement in memory usage. The amount of memory usage is remarkably reduced.
Name:Ozeki VoIP SIP SDK v8.1.1
Updated: 2011.07.21.
Download:VoIP_SDK-8.1.1.zip (14.6 MB)
Changes:
  1. Sample programs have been improved for greater efficiency.
  2. Improvement in documentation.
Name:Ozeki VoIP SIP SDK v8.1.0
Updated: 2011.07.15.
Download:VoIP_SDK-8.1.0.zip (16.1 MB)
Changes:
  1. Improvement in compatibility with Sipnet.ru.
  2. NAT autodetection.
  3. Improvement in audio file handling.
Name:Ozeki VoIP SIP SDK v8.0.0
Updated: 2011.07.13.
Download:VoIP_SDK-8.0.0.zip (16.3 MB)
Changes:
  1. Extended codec support has been added:
    • iLBC
    • G722
    • G729
    • SPEEX
    • GSM
  2. Unified media handling has been added. Meaning that various audio devices can be handled in a unified way.
  3. Totally new audio subsystem has been added to highly improve performance and quality.
  4. Updated sample programs on the various utilization possibilities of the Ozeki SDK.
  5. Improvement in documentation.
  6. Simpler registration.
  7. Simpler usage.
  8. Built-in ring tones, ringback tones, DTMF signals, etc, have been added.
Name:Ozeki VoIP SIP SDK v7.5.1
Updated: 2011.06.27.
Download:VoIP_SDK-7.5.1.zip (18.2 MB)
Changes:
  1. Improvement has been made in wav recording.
  2. Improvement in documentation.
Name:Ozeki VoIP SIP SDK v7.5.0
Updated: 2011.06.23.
Download:VoIP_SDK-7.5.0.zip (18.2 MB)
Changes:
  1. .NET FRAMEWORK 3.5 is also supported beside .Net Framework 4.0.
  2. This release includes various sample programs with source code (e.g. for creating a softphone, DTMF IVR, IVR voice recognition, etc) to demonstrate the flexibility of Ozeki SIP SDK.
  3. Compatibility with Cisco Unified CM, Freeswitch and Trixbox has been improved.
    Further functions have also been added:
  4. Hold: It ends voice communication (even if the PBX does not handle HOLD function according to the standard).
  5. Packet manipulation: It allows to insert own fields into incoming/outgoing SIP messages, or to modify an existing field.
  6. Redial and Call history have been added to the Demo application.
  7. Handling of Outbound proxy has been added.
  8. Call recording function has been improved.
  9. It is possible to select the audio device to be used.
  10. Volume indicators have been included in the Demo.
Name:Ozeki VoIP SIP SDK v7.4.0.
Updated: 2011.06.03.
Download:VoIP_SDK-7.4.0.zip (7.0 MB)
Changes:
    Compatibility with the following PBXs has been highly improved in this version:
  1. FreePBX
  2. Kamailio
  3. OpenSIPS
  4. SIPX
Name:Ozeki VoIP SIP SDK v7.3.0.
Updated: 2011.05.11.
Download:VoIP_SDK-7.3.0.zip (6.0 MB)
Changes:
  1. This new release supports STUN protocol to further improve NAT compatibility.
  2. VS2010 ADD-In has been added to be able to use the License Manager in a simpler way.
Name:Ozeki VoIP SIP SDK v7.2.0.
Updated: 2011.04.22.
Download:VoIP_SDK-7.2.0.zip (5.5 MB)
Changes:
  1. In this version we include STUN protocol support to further improve NAT compatibility.
  2. This version is also compatible with Asterisk PBX.
Name:Ozeki VoIP SIP SDK v7.1.0.
Updated: 2011.03.17.
Download:VoIP_SDK-7.1.0.zip (5.4 MB)
Changes:
  1. In this version of Ozeki VoIP SDK we introduce the basic NAT support for better communication.
  2. Network keepalive mechanism has also been added.
Name:Ozeki VoIP SIP SDK v7.0.0.
Updated: 2011.02.04.
Download:VoIP_SDK-7.0.0.zip (5.3 MB)
Changes:
  1. In this new release of Ozeki SIP SDK the whole SIP stack has been redesigned.
  2. This version is based on .Net Framework 4.0.
  3. All example programs have been further improved.
Name:Ozeki VoIP SIP SDK v6.2.0.
Updated: 2010.11.04.
Download:VoIP_SDK-6.2.0.zip (5.2 MB)
Changes:
  1. This version of Ozeki VoIP SIP SDK supprots Speex codec for more efficient communciation.
  2. Auto Gain Control functionality has been added.
  3. Accustic echo cancellation feature has also been introduced.
Name:Ozeki VoIP SIP SDK v6.1.0.
Updated: 2010.10.13.
Download:VoIP_SDK-6.1.0.zip (5.1 MB)
Changes:
  1. We improved the performance to reduce CPU usage.
  2. Voice Activity Detection functionality has been added.
  3. This version is compatible with 3CX phone system.
Name:Ozeki VoIP SIP SDK v6.0.0.
Updated: 2010.08.12.
Download:VoIP_SDK-6.0.0.zip (5.0 MB)
Changes:
  1. DSP (Digital sound processing) functionality has been added to this new release.
  2. NOISE cancellation function has also been added to achieve much better voice quality.
Name:Ozeki VoIP SIP SDK v5.2.0.
Updated: 2010.05.07.
Download:VoIP_SDK-5.2.0.zip (4.9 MB)
Changes:
  1. A MOCK softphone has been introduced to help testing.
  2. Mute Sound function has been added.
  3. New example program has been introduced.
Name:Ozeki VoIP SIP SDK v5.1.0.
Updated: 2010.03.06.
Download:VoIP_SDK-5.1.0.zip (4.8 MB)
Changes:
  1. New logging sub system has been introduced.
  2. Access SIP messages directly.
  3. SDP update.
Name:Ozeki VoIP SIP SDK v5.0.0.
Updated: 2010.02.23.
Download:VoIP_SDK-5.0.0.zip (4.7 MB)
Changes:
  1. New redesigned SIP parser. It is more compatible, reliable and faster than the previous SIP parser.
  2. Improvement: Not all DTMF signals were indicated. This issue has been fixed.
  3. Updated documentation and Help.
Name:Ozeki VoIP SIP SDK v4.2.0.
Updated: 2010.01.08.
Download:VoIP_SDK-4.2.0.zip (4.6 MB)
Changes:
  1. IGNORE function has been added.
  2. Forward function has been implemented.
  3. .Software volume control feature has been introduced.
Name:Ozeki VoIP SIP SDK v4.1.0.
Updated: 2009.10.05.
Download:VoIP_SDK-4.1.0.zip (4.5 MB)
Changes:
  1. HOLD function has been added.
  2. TRANSFER function has been introduced.
  3. New example program has been added.
Name:Ozeki VoIP SIP SDK v4.0.0.
Updated: 2009.08.24.
Download:VoIP_SDK-4.0.0.zip (4.4 MB)
Changes:
  1. The network layer has been redesigned. Therefore the network layer has become faster and more stable.
  2. packet lost concealment feature has been added.
Name:Ozeki VoIP SIP SDK v3.2.0.
Updated: 2009.06.09.
Download:VoIP_SDK-3.2.0.zip (4.3 MB)
Changes:
  1. Auto Answer function has been added.
  2. DND function has been introduced.
  3. Support play the wave file to a special line (session).
  4. Support record the conversation on a special line(session).
Name:Ozeki VoIP SIP SDK v3.1.0.
Updated: 2009.04.15.
Download:VoIP_SDK-3.1.0.zip (4.2 MB)
Changes:
  1. DTMF as SIP INFO message is supported.
  2. DTMF as specially marked events in the RTP stream is also supported.
  3. Jitter buffer has been added to the RTP. Therefore the voice quality has been improved.
Name:Ozeki VoIP SIP SDK v3.0.0.
Updated: 2009.02.06.
Download:VoIP_SDK-3.0.0.zip (4.1 MB)
Changes:
  1. Sound devices are handled efficiently.
  2. Voice can be recorded during conversations in wav format.
  3. More detailed logging has been added.
Name:Ozeki VoIP SIP SDK v2.3.0.
Updated: 2009.01.14.
Download:VoIP_SDK-2.3.0.zip (4.0 MB)
Changes:
  1. We introduce manual codec selection in this release. Therefore you can select the codec you wish to use easily according to your needs.
  2. A sample program has been added.
  3. Dynamic codec handling is also supported.
Name:Ozeki VoIP SIP SDK v2.2.0.
Updated: 2008.11.02.
Download:VoIP_SDK-2.2.0.zip (3.9 MB)
Changes:
  1. This version supports multiple calls to be made in the same line simultaneously.
  2. Beside multiple calls multiple SIP lines are also handled simultaneously.
Name:Ozeki VoIP SIP SDK v2.1.0.
Updated: 2008.09.10.
Download:VoIP_SDK-2.1.0.zip (3.8 MB)
Changes:
  1. This version of Ozeki VoIP SIP SDK supports g711 codec.
  2. GSM codec support is also included for more efficient communication.
Name:Ozeki VoIP SIP SDK v2.0.0.
Updated: 2008.08.07.
Download:VoIP_SDK-2.0.0.zip (3.7 MB)
Changes:
  1. This version of Ozeki SIP SDK also supports RTP beside SIP. In this way voice calls can be established more efficiently.
  2. The registration in the PBX has been further improved. Previously the SDK does not always register in the PBX. This issue has been fixed.
Name:Ozeki VoIP SIP SDK v1.2.0.
Updated: 2008.05.16.
Download:VoIP_SDK-1.2.0.zip (3.6 MB)
Changes:
  1. Now the system is able to register in the PBX succssfully.
  2. A more detailed documentation has been added to the SDK to help more efficient handling.
Name:Ozeki VoIP SIP SDK v1.1.0.
Updated: 2008.04.05.
Download:VoIP_SDK-1.1.0.zip (3.6 MB)
Changes:
  1. Logging function has been added to the SDK to achieve more efficient debugging.
  2. A major improvement in ATA handling has been introduced.
Name:Ozeki VoIP SIP SDK v1.0.0.
Updated: 2008.02.17.
Download:VoIP_SDK-1.0.0.zip (3.5 MB)
Changes:
  1. We are proud to announce that the first official release of Ozeki SIP SDK is available. This component supports SIP protocol effectively and allows to create a C# softphone or a VB.Net softphone in minutes in any software developed in .Net.
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