Twilio Voice
Create a scalable voice experience with the API that connects millions globally. With Twilio Voice, you can build unique phone call experiences with one API, to create, receive, control and monitor calls with just a few lines of code. Create an engaging voice experience that you can quickly scale and modify with a wide array of customization options and resources, like our Voice SDK. Then, add on features like Interactive Voice Response (IVR), recording transcriptions, and speech recognition to create an experience that your customers will appreciate.
Whether you're looking to set up global conferencing or alerts & notifications, Twilio has the support you need for building with Voice. Find docs, code samples, helper libraries, and developer tools such as Twilio Runtime and our visual workflow builder, Studio.
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SignalWire
An elastic communications cloud with advanced APIs for voice, SMS and video designed by the original geeks of software-defined telecom. When your audience is large, your brand is premium, and you won't settle for janky video conferencing UX, you want this. Real time, granular control over call flows, routing, and codecs. 300% more responsiveness than you get with REST. If you use AI in your voice apps, you just found your new favorite API. If you're more comfortable with REST than WebSockets or already use TwiML, these APIs are like TwiML...if TwiML suddenly knew Kung Fu. The SMS API makes it easy to move your expensive SMS traffic to SignalWire and cut your billio 50-80% in the process. Launch and scale communication products on infrastructure built for this decade and the next rather than running aground on the limitations of 2010s-era SaaS. Persistent, bi-directional connections between your video and voice apps and our infrastructure means 300% more responsiveness.
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VaxVoIP SIP Phone SDK
VaxVoIP SIP Phone SDK helps developers build branded SIP softphones and VoIP applications for Windows, Android, iPhone, and iPad. It provides SIP signaling, media handling, and call-control APIs for voice and video, messaging, presence, multiple SIP accounts, and concurrent call lines. Features include conferencing, call hold, transfer and forwarding, WAV call recording, SIPREC client support, echo cancellation, jitter buffering, and answering-machine detection. Sample projects cover C#, VB.NET, WPF, Visual C++, Delphi, Java, Objective-C, and Swift, with platform-specific documentation. The SDK connects applications to standards-based SIP servers, IP-PBX systems, gateways, and telephony providers. Use cases include softphones, mobile VoIP apps, call-center tools, auto-dialers, and embedded business communications. A fully functional 30-day trial is available; annual licenses are sold separately for Windows, Android, and iOS.
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AVOXI
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The effective, affordable, and easy-to-use cloud-based call center software, AVOXI Genius. Easily manage your business communications from an intuitive, web-based contact center. AVOXI Genius is the first platform to integrate your contact center solution with your voice service, with virtual phone numbers available for instant activation in 170+ countries. With plans starting at $19.99 per user, AVOXI Genius is one of the most affordable solutions worldwide! Get 2 months free--limited time only.
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