VoIP SDK, SIP SDK, Softphone SDK, VoIP PBX, SIP PBX, IP PBX | portsip.com
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VoIP SDK: Accelerate and simplify the development of voice, video and IM

VoIP SDK Reinvent Communications

Performance & Reliability

Accelerate Business Innovation



Develop UC, VoLTE and ViLTE Apps on Mobile and Desktop

The PortSIP VoIP SDK has intuitive and flexible APIs that developers can easily use to quickly implement IP-based voice and video applications and meet the requirements of Unified Communications, IoT/M2M, Public-Safety critical communications, provides a complete, pre-integrated solution that allows customers to focus on the GUI and high-level application, without any need for complicated integrations or VoIP know-how.

Customize Apps for Video Communication base on VoIP SDK

PortSIP VoIP SDK is a state-of-the-art standard based client to add HD video and HD audio communication to any product and service. The  SIP SDK is available for all leading operating systems, enabling a fast time-to-market on all platforms which include iOS, Android, macOS and Windows.


  • No VoIP knowledge necessary if develop apps base on PortSIP VoIP SDK
  • HD audio and video call: Opus, G.722.1, AMR-WB, H.264, VP8
  • HD video conferencing, no video conference server required, up to 1080P
  • Instant Message and Presence
  • Multi-platforms support: iOS, Android, Mac OSX and Windows
  • CallKit support (iOS Platform only)
  • Support for multiple programming environments
  • Sample GUI and sample application included
  • Easy-to-use API enabling integration into your application
Softphone SDK

Royalty free license, bundle discount

All PortSIP VoIP SDK packages license are royalty free. The buyer may freely distribute his applications based on the SDK. Buyer pay a one-time license fee in return for the rights to develop unlimited applications and distribute his applications to as many end-users as he like without paying any royalties or license fees.


If purchase PortSIP VoIP SDK with PortSIP PBX or PortSIP WebRTC Gateway together, the Bundle License with DISCOUNT is available, please Contact Us for more information.

Quickly get applications and devices to market

Many new standards are being developed to address the fast-growing UC, IoT and M2M market. However, keeping up with these ever-changing standards is a challenge for developers, take away the headaches associated with adhering to standards and ensuring interoperability between devices and platforms.


The PortSIP VoIP SDK comes with a sample application in source code, a detailed set of APIs and comprehensive documentation help  to reduces development, integration, and testing efforts.

VoIP SDK for iOS, Android, MacOS, Windows, Linux

Key highlights

  • Support iOS, Android,  mac OS and Windows desktop platforms
  • Available in .NET, Java, Swift, Xamarin and Objective-C, C++, Delphi, Javascript for Web browser
  • Support callkit for iOS
  • Support Support 3GPP IMS Conferencing and 3GPP Call-Waiting
  • Support Present Agent(PUBLISH)
  • Provide audio, video, presence, IM in unified API for all platforms
  • Audio codecs: G.711 aLaw/uLaw, G.722.1, G.722, SPEEX, SPEEX-WB, AMR, AMR-WB, GSM, iLBC, G.729, Opus, SILK
  • Video codecs: H.264, VP8, H.263, H.263-1998
  • AMR, AMR-WB codec: comply with RFC 4867 support, include Bandwidth- Efficient and Octet – Aligned mode, amr-red, amr-maxptime
  • Play AVI file to remote side
  • Play wave file to remote side
  • Allows send PCM stream to remote ide instead of microphone input.
  • Allows send i420 stream data to remote instead of camera input
  • Access incoming audio and video stream directly
  • Access received and sending SIP message directly
  • Access received and sending RTP packet directly
  • Support 3GPP IMS features: Call-Waiting and Conferencing focus
  • Allows monitor the dialog status
  • Support add/obtain custom SIP header and modify outgoing SIP header
  • Proven operability with a wide range of SIP-based network equipment including Cisco, Qualcomm, Agilent, Keysight, Avaya, Unify, HP, Philips, NEC and others
  • Product support and sample application included to help get developers quickly up to speed in designing and deploying their application
  • Deliver superb video quality even in challenging network conditions through advanced algorithms combined with PortSIP’s extensive experience in networking

Related Resources

Sample Project NameDownload LinkDocumentations
PortSIP VoIP SDK v15.1 for iOS(Swift, Objective-C) Download Download
Online Manual
PortSIP VoIP SDK v15.1 for Android(Android Studio, Eclipse) Download Download
Online Manual
PortSIP VoIP SDK v15.1 for Xamarin(iOS, Android) Download
PortSIP VoIP SDK v15.1 for Windows(.NET, Delphi, VC) Download Download
Online Manual
PortSIP VoIP SDK v15.1 for macOS(XCode) Download Download
Online Manual
Documentation NameDownload Link
PortSIP VoIP SDK License Agreement Download
PortSIP VoIP SDK Datasheet Download

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