SIP trunking (Session Initiation Protocol trunking) is a technology that lets your business make and receive phone calls over the internet instead of traditional phone lines. Think of it as a digital bridge that connects your phone system (PBX) directly to carriers in India and beyond with zero hops, maximum stability, crystal-clear quality.
With PBX.IM's SIP trunking service, you can:
Looking for a virtual phone number for business in India that does more than just calls? PBX.IM gives you a complete VoIP solution that helps you connect, scale, and manage communication across channels: calls, SMS, and WhatsApp, all in one place.

Calling from +31 22 345 66
Enjoy crystal-clear calling across India, from landlines to mobiles and beyond. Experience HD voice quality with 99.999% uptime, and choose local DID numbers in Mumbai, Delhi, Bangalore and other major cities, plus toll-free, shared-cost and mobile options tailored to your business.
Connect with customers via SMS and WeChat. Send reminders, confirmations, and marketing messages — all managed from one platform.
Let AI Agent answer calls 24/7 in Mandarin and English. Use Zoom Phone integration to make business calls directly within Zoom.
Leveraging India top carrier networks, we provide high-quality voice services with guaranteed connectivity and deep local expertise.
India's largest mobile operator by subscribers.
Major Indian telecom with global presence.

Vodafone-Idea merger, branded as Vi.
Build trust with Indian customers by using local, toll-free, and national numbers they recognize. Get DID numbers in Mumbai, Delhi, Bangalore and other major cities across India.
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Make and receive calls directly within Microsoft Teams, Zoom, or WhatsApp using your India phone numbers without switching between apps.
Keep your team productive, and give your customers a seamless experience.
PBX.IM integrates seamlessly with your existing business tools, CRM, helpdesk, website, or internal systems.
Your calls are routed through local Indian carriers for the best quality and reliability. Manage everything from one global platform, anywhere in the world.
Navigating India’s telecom regulations can be challenging. PBX.IM handles the compliance requirements for you, so you can focus on running your business without worrying about local regulations.
PBX.IM connects directly to tier-1 carriers in India for stable, high-quality voice with minimal latency. Redundant routing and automatic failover keep your calls running no matter what.
Customers are more likely to pick up when they see a local number. PBX.IM gives you geographic, national, and toll-free India numbers so your calls get answered.
Pay only for what you use with transparent per-minute rates. No hidden fees, no contracts, no unexpected charges on your bill.
Combine reliable India SIP trunking with unified communications including voice, video, messaging, and collaboration in one scalable platform.
Sign up, configure your settings, and start making calls to India in minutes with our self-service platform.

Every call is protected end-to-end. TLS encryption secures your call setup data, preventing interception or spoofing of who's calling whom. SRTP encrypts the actual audio, so no one can eavesdrop, even on public networks. With IP whitelisting, user-level permissions, and call destination restrictions, you control exactly who accesses your system. Built to meet GDPR, HIPAA-ready, SOC 2, and ISO 27001 standards.
PBX.IM ensures your SIP trunking meets India's MIIT regulations, including proper number registration, anti-fraud compliance, and direct partnerships with licensed state carriers. We handle the regulatory complexity so you stay connected and compliant.
Sign Up and Get Your SIP Trunk in Minutes.