Compare JustCall vs. SIPSTACK

Aircall transforms business communications with an intelligent, cloud-based phone system built for modern sales and customer support. More than just a calling tool, it provides an all-in-one hub that connects phone, SMS, and WhatsApp conversations in a single platform. Its AI Assist Pro feature delivers real-time coaching during calls and simplifies follow-up, enabling reps to sell smarter and resolve support issues faster. Teams can leverage advanced capabilities like call routing, IVR, analytics dashboards, and power dialers to maximize efficiency. With integrations across Salesforce, HubSpot, Zendesk, Intercom, Shopify, and 250+ other apps, Aircall seamlessly fits into existing workflows. Businesses benefit from reliable call quality, international number coverage, and scalable features that grow with their needs. Customer stories highlight improvements such as a 4% increase in CSAT scores and the ability to process 25,000+ calls per month with stability and ease. Aircall makes customer conversations more personal, productive, and impactful—without the complexity of traditional systems.

CTM is a cloud-based conversation analytics and lead management platform designed to connect marketing attribution with customer communications and sales outcomes. Formerly known as CallTrackingMetrics, the software provides call tracking, conversation intelligence, lead routing, and contact center functionality. Its call tracking technology uses dynamic number insertion to attribute incoming calls to specific advertising campaigns, keywords, websites, and marketing channels. The platform also tracks SMS conversations, website form submissions, and online chats to provide a consolidated view of customer engagement. AI-powered analytics automatically transcribe, summarize, score, and analyze conversations to identify customer sentiment, purchasing intent, and potential sales opportunities. CTM includes AI voice agents that can answer inbound calls, qualify prospects, schedule appointments, and route inquiries to appropriate team members. Workflow automation tools support lead distribution, customer follow-ups, notifications, and CRM updates based on configurable business rules. Its reporting capabilities include real-time dashboards, advertising ROI analysis, agent performance monitoring, and campaign attribution reports. CTM integrates with marketing, analytics, and CRM platforms through native integrations, APIs, webhooks, and customizable automation tools.

Customer experience shouldn't run on disconnected tools and static scripts. Dialpad Contact Center brings voice, digital channels, and human agents together in a single AI-native platform, built to act — not just record — on every customer interaction. This is Agentic AI in practice: agents that reason through a problem, take the next step, and drive it to resolution without waiting on a human to intervene. Where legacy systems leave data trapped in silos, Dialpad Contact Center closes that gap, linking voice and data so context travels with the customer instead of getting lost between systems. The payoff compounds. Dialpad has already generated over 775 million AI recaps, and each new interaction adds to a growing base of operational intelligence — sharper resolution paths, more productive agents, better outcomes quarter over quarter. None of it runs unchecked: Dialpad's Guardian layer keeps AI operations secure and governed, so intelligence scales without sacrificing oversight. In practice, that means up to 80% of issues get resolved autonomously, freeing your team to focus on the conversations that genuinely need a human. Intelligence works at the edge; people stay at the center of the experience. And you don't have to take the ROI on faith. Through Dialpad's Proving Ground, enterprises can validate performance and cost savings before rolling out at scale — a far more reliable path than betting on a brittle, rules-based bot.

Intermedia Unite is an all-in-one business communications and collaboration platform designed to keep employees connected and responsive across locations, devices, and teams. The solution combines cloud phone service, video meetings, team messaging, file sharing, customer engagement tools, and productivity features into one integrated platform. By consolidating multiple communication tools, Unite reduces app switching and gives employees a simpler way to call, meet, chat, share files, and engage customers from desktop or mobile devices. Its enterprise-grade calling system includes more than 100 voice features that support professional business communications and consistent customer interactions. The platform also supports enhanced Microsoft Teams experiences, helping organizations extend communication capabilities within their existing collaboration environment. AI features such as transcription, summaries, and conversation insights help users retain important information, identify follow-up actions, and improve team efficiency. Mobile and desktop apps allow employees to maintain a consistent business identity whether they are in the office, remote, or on the go. Backed by strong uptime commitments and J.D. Power-certified support, Intermedia Unite is built for reliability and ease of use. By unifying communications, collaboration, and engagement, Unite helps organizations increase productivity while improving the way teams serve customers.

Bigly Sales runs AI outbound and inbound calling as a managed service. Its AI voice agents call new and aged leads, qualify them against your criteria, live-transfer interested prospects to your team, book appointments, and answer inbound calls 24/7, with every disposition, transcript and recording written back to your CRM. Bigly's team builds the campaign for you. Scripts are written with Claude, ChatGPT and other leading LLMs, and the platform tests script versions on live calls and keeps the best performer. Bigly also handles phone-number procurement, carrier registration, more than 200 whitelisted local-presence lines, spam monitoring and call routing. Before every dial, the system checks consent, suppression and DNC lists, known TCPA litigants, and state and federal calling rules and quiet hours. The reporting dashboard measures success rate per lead, cost per live transfer and cost per human contact, and breaks the dial-to-transfer funnel into each stage, including transfers lost to an unanswered buffer or a carrier error. Lead sources are ranked side by side by success rate and cost. An hour-by-hour chart shows when leads convert. With the Bigly Sales MCP server, customers can manage campaigns from Claude or ChatGPT: push a list into an active campaign, check minute usage, pull transcripts, or ask which leads want a demo. Customers use it for lead reactivation, speed-to-lead follow-up, appointment setting, inbound answering and warm transfers in insurance, lending, home services, legal and fundraising. It integrates with HubSpot, Salesforce, Zoho CRM, Pipedrive, GoHighLevel and other CRMs, and plans start at $99 a month, with a free 30-minute AI calling setup to begin.

Zoom Phone is a cloud-based VoIP phone system designed to help businesses manage voice communications, employee collaboration, and customer calls. The platform combines business calling, SMS messaging, voicemail, video conferencing, and team chat within the Zoom Workplace environment. Users can make and receive calls through desktop applications, mobile devices, web-connected systems, and supported physical desk phones. Its call management capabilities include multi-level auto attendants, call queues, call transfers, forwarding, shared lines, and customizable business hours. Built-in AI features generate call summaries, identify action items, prioritize voicemails, and provide contextual assistance during conversations. Zoom Virtual Agent Receptionist adds conversational AI capabilities for answering business questions, booking appointments, and routing callers based on their needs. Call monitoring and reporting tools provide visibility into call volumes, usage patterns, connection quality, and employee communication activity. Zoom Phone integrates with Salesforce, Microsoft Teams, Google Workspace, and other business applications to connect calling activities with existing workflows. Its centralized administration tools support phone number management, device provisioning, user permissions, call recording policies, and communication security across distributed organizations.

Turn the world into your office. 800.com allows you to manage your business from your cell phone. No contract, advanced calling features, forwarding for cell phones, and advanced calling features Increase conversions, brand recall, higher call response, and SMS messaging. Manage extensions, send professional greetings and manage your account online. 800.com offers standard forwarding as well as simultaneous and sequential ringing. Toll free numbers are the best standard for telephone numbers and will be taken seriously by US customers. Local numbers signal that your company isn't focused on doing business in the entire country. Every 800.com member has access to every phone system tool, regardless of the plan they choose. You will not only help your customers avoid long distance fees but also your company.

DialedIn is a cloud-based call center software built for teams that demand reliability, performance, and control at scale. It streamlines operations with intelligent tools that simplify call management, optimize agent workflows, and improve customer experiences. Rather than adding layers of complexity, DialedIn provides a flexible, scalable system that reduces wasted time and helps contact centers operate more efficiently. From inbound and outbound calling to blended environments, DialedIn is engineered to adapt to evolving business needs while maintaining compliance and uptime. • Intelligent Call Routing: Matches each customer with the right agent to improve satisfaction and better balance workloads. • Proven Dial Strategies: Leverages advanced algorithms to enhance contact rates and reduce downtime. • Customizable Tools: Adapts to your specific operational needs, ensuring that the technology works for you, not the other way around. • 100% US-Based Support: Offers comprehensive support, including technical and account management, ensuring maximum utilization of the dialer. • CleanCallerID™: An innovative feature that monitors and swaps out DIDs tagged as SPAM/SCAM by carriers with fresh DIDs automatically, ensuring uninterrupted customer interaction. With built-in analytics, reporting, and automation features, supervisors gain full visibility into agent performance and call outcomes, allowing for smarter decision-making and stronger ROI. DialedIn is not only designed to maximize live connections but also to keep agents connected with customers through secure, dependable, and user-friendly technology. By removing friction from daily operations, DialedIn empowers contact centers of all sizes to focus less on manual processes and more on delivering excellence.

Adversus serves as an outbound dialing solution designed to enhance your calling strategies, automate tedious tasks, and deliver essential insights for optimizing outbound workflows and overall efficiency. Founded in 2015, Adversus emerged from the founders' frustrations with the rigidity of their previous solution, igniting a vision to create a transformative outbound tool. We prioritize user-driven innovation, recognizing that each user possesses unique needs and expectations. Our platform offers extensive flexibility and customization across all workflow elements, ensuring that our users can tailor their experience to meet specific requirements. At Adversus, we strive to develop a forward-thinking solution that remains relevant and cutting-edge, aiming not just to respond to market changes, but to redefine what is achievable within the industry. Businesses across various sectors utilize Adversus to enhance their outbound calling activities, with user bases that can range from a single user to several hundred, all united by the goal of increased efficiency. Ultimately, our commitment to innovation and user satisfaction sets us apart in the competitive landscape of outbound dialing solutions.

Squaretalk is a powerful contact center solution that transforms how modern sales teams connect with prospects and customers, convert sales opportunities, and grow their operations. It offers AI Voice Agents, omnichannel communication (including voice, WhatsApp messaging, SMS, and email), powerful call-handling features, and affordable scalability without additional complexity or costs. Squaretalk combines powerful communication tools with intelligent automation to help teams work more efficiently and deliver better customer experiences. Advanced call handling, automated transcripts, and sentiment analysis provide greater visibility into every conversation. The built-in contact management system keeps interactions organized and ensures no lead falls through the cracks. Flexible workflows can be customized to match specific operational needs, while advanced reporting tools offer actionable insights into team performance and business outcomes. Internal chat streamlines collaboration through instant communication, simplified mentoring, efficient escalations, and the consolidation of internal and external conversations within a single platform. Backed by enterprise-grade security, Squaretalk ensures that customer data remains protected and compliant. With local numbers in over 150 popular and niche destinations, we enable businesses of all sizes to establish and maintain a local presence, build trust, support their global expansion, and shorten sales cycles. Discover how Squaretalk’s cloud contact center platform can enhance your team’s connection rates and performance.