Best Voice Calling API & SDK Providers for HubSpot CRM

Use the language you already love to prototype ideas quickly, develop production-ready communications applications, and run serverless applications on one API-powered platform. Twilio is a single fully-programmable platform with flexible APIs for any channel, built-in intelligence, and global infrastructure to support you at scale. Quickly integrate powerful APIs to start building solutions for SMS and WhatsApp messaging, voice, video, and email. Browse documentation and SDKs in multiple coding languages, including Ruby, Python, PHP, Node.js, java, and C#, or jumpstart your first project with our open source code templates to quickly build production-ready communications apps. Consult our community of over 9 million developers for guidance and inspiration on your next project. Sign up and start building today.

Authkey.io stands as an exceptional Enterprise Omni Channel API platform, offering an extensive suite of communication tools and APIs meticulously designed to empower businesses in their quest for efficient and secure customer engagement. SMS API:A seamless communication symphony with its event-based messaging prowess. This facet encompasses the seamless orchestration of Bulk SMS delivery, transactional messages, one-time passwords (OTP), and the authentication process through call-based interfaces. Voice API: This dynamic capability ensures the delivery of OTPs through vocal messages, providing an alternative avenue that ensures the recipient's prompt access. Email API: Reliable and rapid delivery of emails, serving critical functions such as password verification, account creation, OTP distribution, and email validation. WhatsApp Business API: The contemporary business landscape requires a direct conduit to reach the massive audience on the WhatsApp API facilitate this engagement, enabling businesses to establish a direct line of communication with their audience. Two-Factor Authentication (2FA) API: Seamlessly dispatching OTPs, verifying logins, and bolstering the security architecture of business software, CRM systems.

Conversations are the best way to create customer journeys. Engaging experiences that move customers. Developers love it. Built for business. Vonage Communications APIs (formerly Nexmo), help growing startups and agile businesses improve their customer experience and realize new business results at scale. Our APIs, global platform and expert support make it easy to simplify communications and innovate faster. Voice interactions can be reimagined to transform customer experiences. Every message should be viewed as an opportunity for you and your customers. Secure and private logins are made easier with this tool. Cloud-based voice applications that are modern and high-quality. You can programatically send and get SMS from almost every country. Get real-time information on any phone number around the globe. You can make and receive calls using your existing VoIP infrastructure.

You can add real-time voice, video and messaging to your VoIP, web and mobile services. No CapEx. No contracts. You only pay as you grow. You have complete freedom to create what you want. Apidaze Voice APIs make it easy to manage inbound and outbound calls. You don't need to have complicated phone systems or make commitments with large carriers. Apidaze allows you to access phone numbers in more that 8,000 cities across 60 countries. You can create simple IVRs without a phone system. Play a welcome message and route the call to different people based on the caller's input. With over 6,000,000,000 SMS being sent every day in the US, SMS is quickly becoming an important communication medium for keeping in touch with customers.