Next-Gen VoIP Solutions for Modern Business

Seamless SIP connectivity, international phone numbers, and crystal-clear voice quality for businesses that demand reliability.

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Our Services

Comprehensive VoIP and SIP solutions tailored to your business needs

VoIP Connectivity

High-quality voice over IP connections with 99.99% uptime guarantee and crystal-clear audio quality.

International Numbers

Local and toll-free numbers from 100+ countries to establish your global presence instantly.

SIP Trunking

Flexible, scalable SIP trunking solutions that connect your PBX to the public telephone network.

Call Center Solutions

Complete call center infrastructure with advanced routing, analytics, and integration capabilities.

PBX Solutions

Fully-featured cloud PBX systems with AI-powered call management, intelligent auto-attendants, and seamless team collaboration.

100+
Countries Covered
99.99%
Uptime Guarantee
24/7
Technical Support
5000+
Happy Clients

Business Solutions

Tailored VoIP solutions for businesses of all sizes

Enterprise

Comprehensive communication solutions for large organizations with complex requirements and multiple locations.

  • Dedicated account management
  • Custom integration services
  • Advanced security protocols
  • Unlimited concurrent calls

SMB

Flexible and affordable VoIP solutions designed specifically for small and medium-sized businesses.

  • Easy scalability
  • Cost-effective packages
  • Simple web interface
  • CRM integrations

Developers

Powerful APIs and SDKs to integrate voice, messaging, and phone numbers into your applications with programmatic voice capabilities.

  • Comprehensive API documentation
  • WebRTC support
  • AI-powered programmatic voice as a service
  • Sandbox testing environment
  • Pay-as-you-go pricing

Key Features

What makes Calls.sl the preferred choice for business communications

Enterprise-Grade Security

End-to-end encryption, TLS/SRTP protocols, and advanced fraud protection to keep your communications secure.

High Performance Network

Global network infrastructure with multiple redundancies ensuring minimal latency and maximum reliability.

Easy Integration

Seamless integration with popular business tools, CRMs, and communication platforms.

Real-time Analytics

Comprehensive dashboards and reporting tools to monitor call quality, usage, and performance metrics.

Flexible Routing

Advanced call routing capabilities with time-based, geographic, and skill-based options.

HD Voice Quality

Crystal-clear audio with wideband codec support and adaptive quality optimization.

AI-Powered Programmatic Voice

Build intelligent voice applications with our AI-powered programmatic voice API for automated calls, natural language IVR systems, and smart voice notifications.

Ready to Transform Your Business Communications?

Join thousands of businesses that trust Calls.sl for their critical communication needs.

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Transparent Pricing

Flexible plans designed to scale with your business

Starter

$ 29 /month
  • 2 Phone Numbers
  • 500 Minutes
  • Basic Call Features
  • Web Dashboard
  • Email Support
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Most Popular

Business

$ 79 /month
  • 5 Phone Numbers
  • 2,000 Minutes
  • Advanced Call Features
  • API Access
  • 24/7 Support
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Enterprise

$ 199 /month
  • 20 Phone Numbers
  • 10,000 Minutes
  • Premium Features
  • Custom Integrations
  • Dedicated Account Manager
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Region Local Numbers Toll-Free Mobile
United States $1.99/mo $3.99/mo N/A
United Kingdom $2.49/mo $4.99/mo $6.99/mo
European Union $2.99/mo $5.99/mo $7.99/mo
Asia Pacific $3.49/mo $6.99/mo $8.99/mo
Other Regions From $3.99/mo From $7.99/mo From $9.99/mo

Basic SIP

$ 49 /month
  • 5 Concurrent Calls
  • 1,000 Minutes
  • Standard Codecs
  • Basic Security
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Professional SIP

$ 129 /month
  • 15 Concurrent Calls
  • 5,000 Minutes
  • Premium Codecs
  • Advanced Security
Get Started

Enterprise SIP

Custom Pricing
  • Unlimited Concurrent Calls
  • Volume-Based Pricing
  • All Codecs Supported
  • Enterprise Security
Contact Us

All plans include 24/7 technical support, online dashboard, and no long-term contracts. Volume discounts available for larger commitments.

What Our Clients Say

Trusted by businesses worldwide for reliable communications

"Calls.sl transformed our customer service operations. The call quality is exceptional, and the international numbers have helped us establish a global presence without the overhead."

Sarah Johnson

CTO, TechSolutions Inc.

"The reliability of Calls.sl's SIP trunking service is unmatched. We've experienced zero downtime in the two years we've been using their service, which is critical for our 24/7 support team."

Michael Chen

IT Director, Global Retail Group

"As a rapidly growing startup, we needed a phone system that could scale with us. Calls.sl not only provided that flexibility but also offered competitive pricing that fit our budget constraints."

Emma Rodriguez

Operations Manager, InnovateTech

Get Started

Ready to transform your business communications? Contact us today.

info@calls.sl

+1 (555) 123-4567

24/7 Technical Support

Why Choose Calls.sl?

  • Enterprise-grade reliability
  • Transparent pricing
  • No long-term contracts
  • 24/7 technical support
  • Easy setup and integration