Compare VaxVoIP SIP Phone SDK vs. Yeastar K2 IP PBX in 2026

Yeastar K2 IP PBX

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Description

The VaxVoIP SIP Phone SDK enables developers to create customized SIP softphones and VoIP applications compatible with platforms such as Windows, Android, iPhone, and iPad. This powerful SDK encompasses SIP signaling, media management, and call-control APIs that support both voice and video functionalities, messaging, presence features, multiple SIP account integrations, and the ability to handle concurrent calls. Noteworthy features include conference calling, call hold, transfer and forwarding options, WAV recording capabilities, SIPREC client support, echo cancellation, jitter buffering, and detection of answering machines. The SDK also offers sample projects in a variety of programming languages, including C#, VB.NET, WPF, Visual C++, Delphi, Java, Objective-C, and Swift, along with comprehensive documentation tailored to each platform. It seamlessly connects applications with standard SIP servers, IP-PBX systems, gateways, and various telephony service providers. Potential applications for this SDK range from softphones and mobile VoIP solutions to call-center applications, auto-dialers, and integrated business communication systems. Developers can explore a fully functional 30-day trial version, while annual licenses for Windows, Android, and iOS are available for purchase separately, ensuring flexibility for different development needs. Overall, the VaxVoIP SIP Phone SDK provides robust tools and resources designed to streamline the development of high-quality VoIP applications.

Description

Yeastar K2 IPPBX is available as both hardware and software. It supports 2000 users, 500 concurrent conversations, and 400 VoIP trunks across multiple locations. This gives medium and large enterprises full flexibility and capability. Yeastar K2IP PBX is designed to meet the communication needs of today and tomorrow. It offers enterprise-level features and exceptional reliability. It also allows remote working with next-level Linkus UC Softphone.

API Access

Has API Yes

API Access

Has API No

Screenshots View All

Diagram with a central “VaxVoIP SIP PHONE SDK” panel connected in a circle to Windows, Visual Studio, C#, C++, Apple, Android, Swift, and D icons over a dotted world map.

Screenshots View All

Integrations

Asterisk Yes

Explore All 1 Integration

Integrations

Asterisk No

Pricing Details

$2,640/year

Annual single-software licenses: Windows $2,640, Android $2,840, and iOS $2,860. Licenses include technical assistance, updates, new releases, maintenance, and issue resolution.

Free Trial Yes

Free Version No