Develop Your modern UC Client

  • Ready-to-use and shortest Time-to-Market
  • Compatibles with any PBX: Avaya, Mitel, Asterisk, Cisco, NOT FREE
  • Good compatibility with any PBX: Avaya, Mitel, Asterisk, FreeSwitch
  • Sharing screen
  • Voice and Video call over IP and LTE/4G/5G
  • Sending files, pictures, voice and video messages
  • Instant Messaging and Presence
  • HD Video conference, no MCU required
  • Standard based and rigorously tested for interoperability
  • Without any needs for complicated integrations or VoIP know-how.
  • Support iOS, Android, Windows, macOS, Linux, WebRTC
VoIP SDK for developing Client App

Customize Apps

PortSIP VoIP SDK is a modern SIP client framework for developing audio and video calling applications. The SIP SDK is available for all leading operating systems, enabling a fast time-to-market on all platforms, including iOS, Android, macOS, Windows and WebRTC.

  • Sharing screen
  • Audio and video calling
  • Instant Messaging and Presence
  • HD video conferencing, no MCU required.
  • Multi platforms: iOS, Android, macOS, Windows and WebRTC.
  • Support Xamarin, Swift, Android Studio, C#, VC, Xcode, JavaScript
  • Support iCallKit
  • Unique AMR, AMW-WB, Opus, VP9, H.264 and more codecs

Quickly get apps and devices to market

PortSIP VoIP SDK reduces development, integration and testing time required to deploy video communications clients.

PortSIP VoIP SDK is a SIP SDK comes with a sample application in source code, a detailed suite of APIs and comprehensive documentations to help with reducing development, integration, and testing efforts, it's the best Softphone SDK in the market.



If you use it with SIP based PBX such as Asterisk, FreeSwitch, you have to purchase the PortSIP VoIP SDK license, all package licenses are royalty free.

The buyer may freely distribute his applications built based on the SDK. Buyer pay a one-time license fee and get 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.

Key Highlights of Voip sdk

  • Large discount with PortSIP PBX
  • Proven operability with a wide range of SIP-based PBX: Avaya, Mitel, Avaya, Asterisk, FreeSwitch
  • Share screen during the call
  • Sending file, picture, voice and video message likes WhatsApp
  • Multi-part audio and video conferencing without MCU required
  • Presence Agent (PUBLISH) and P2P presence
  • 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
  • Video codecs: H.264, VP8, VP9
  • Support iOS, Android, macOS, Windows, Linux, WebRTC
  • Integrated callkit for iOS
  • Available for .NET, Swift, Xamarin and Objective-C, C++, JavaScript
  • Full compatibles with 3GPP IMS Conferencing and 3GPP Call-Waiting
  • IMS Registration, Authentication, and addressing
  • Allows monitoring the dialog status
  • Security and Encryption: TLS/SRTP
  • AMR, AMR-WB codecs: comply with RFC 4867 support, including Bandwidth- Efficient and Octet – Aligned mode, amr-red, amr-maxptime
  • VoLTE Voice and Video call establishment and termination
  • Video resolutions: CIF, QVG, VGA, XVGA, SVGA, 720P, 1080P, 2K
  • RTCP NACK supported for anti packet loss
  • Support add/obtain custom SIP header and modify outgoing SIP header
  • 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