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SIP Trunking

SIP Trunking

Enterprise SIP Trunk Provider in India: Carrier-Grade Voice, Fully Managed

Connect your IP-PBX, Microsoft Teams, contact centre or AI voice agents to the public telephone network over Viva’s managed network. Scalable channels, built-in failover and a 24x7 NOC behind every call, from a Class “A” ISP with 18+ years of PAN-India experience.

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Prefer to talk? Call 1800 572 1055

  • Class “A”Licensed ISP / ITSP / VNO
  • 24x7NOC monitoring
  • 99.97%uptime SLA
  • Dedicatedaccount manager

Why Viva

Why Viva SIP Trunking is ideal for business

Scale channels as you grow

Add or reduce concurrent call channels as your business changes, instead of buying lines in fixed blocks. Pay for the capacity you need, not the capacity you might need someday.

Voice and connectivity, one provider

Your SIP trunk, the managed internet line it runs on and the failover behind it are delivered and supported by one team. One point of contact, one escalation path, one consolidated invoice.

Guaranteed 24/7 support

A dedicated NOC monitors your voice service around the clock, backed by a 99.97% uptime SLA and a named account manager who knows your setup.

What is it?

What is SIP trunking?

SIP trunking is a way of connecting your business phone system to the public telephone network over an IP connection, replacing traditional PRI/ISDN lines. Your IP-PBX, Microsoft Teams or contact centre platform sends calls through a SIP trunk, and your provider carries them to landline and mobile networks. There are no physical phone lines to install and no fixed channel blocks to buy.

How can it help you?

How can it help you?

  • Lower the cost of running voice: consolidate lines and sites onto one managed service.
  • Scale without rewiring: add channels in line with demand rather than waiting for new physical lines.
  • Stay reachable: route calls to a backup path if a site goes down.
  • Prepare for unified communications and AI: connect your trunk to Microsoft Teams, cloud telephony, contact centre platforms and AI voice agents.
  • Be reachable globally: add a toll-free number so customers can call you from anywhere globally.

How it works

How Viva SIP Trunking Works

Your phone system on one side, the telephone network on the other, and a managed Viva network in between.

Step 1

Connect

Your phone system, contact centre or AI voice agent links to Viva’s session border controller over a managed, dedicated connection.

Step 2

Route

Calls are carried across Viva’s monitored network, with automatic failover if a path drops.

Step 3

Deliver

Calls reach landline and mobile networks. Inbound calls, including toll-free 1800 calls, reach your team on any device.

Features & Benefits

Voice that behaves like infrastructure, not an experiment.

Guaranteed SLA

Your SIP service is backed by a Service Level Agreement with 99.97% uptime, so serious voice issues are resolved quickly and accountably.

Fully Managed Service

Proactive monitoring catches outages early, and one point of contact handles fault isolation end to end. That saves your IT team time and chasing.

Secure by Design

Calls are protected with encrypted signalling and media, and access controls and fraud monitoring help keep your trunk safe.

Flexible Channels & Toll-Free Numbers

Start with the channels you need and scale as your call volumes change. Add a toll-free 1800 number so customers can reach you from anywhere globally, with calls routed straight to your PBX, Microsoft Teams or contact centre. Viva provisions and manages your local and toll-free numbers for you.

Less Hassle

PAN-India coverage, and one consolidated invoice for voice and data across all your locations.

Compatibility & integrations

Works With the Phone System You Already Have

No rip-and-replace. Viva SIP trunking connects to the platforms your teams already use, from IP-PBXs and Microsoft Teams to contact centres and AI voice agents. Our engineers check compatibility before you commit.

IP-PBX platforms

Works with leading IP-PBX platforms. Our engineers validate compatibility before go-live.

Microsoft Teams

Native calling through Viva Teams Connect.

Cloud telephony

Pairs with Viva Meet.

Contact centres

Works with Cloud Contact Center and Contact Center for Microsoft Teams.

CRM and Click-to-Call

Link telephony to your CRM and call straight from your screen.

AI voice agents

Works with Voxcee, Viva’s Voice AI platform. AI-powered voice agents that speak naturally, understand intent and resolve customer conversations instantly, on inbound and outbound calls, 24×7. Your SIP trunk carries every call.

Check compatibility with our engineers

Redundancy, SLA & 24x7 NOC

Built for Always-On Voice

Voice is the one service your customers notice the instant it fails. We design for that from the first line to the last call.

Talk to our network team

  • Resilient last mile

    Dual-line and 4G/5G auto-failover options keep branches and remote sites reachable if a primary link drops.

  • Round-the-clock monitoring

    Our NOC watches your service 24x7 and acts on faults before most teams have noticed them.

  • Clear accountability

    A written 99.97% uptime SLA, a defined escalation matrix and a named account manager.

  • One team, end to end

    From the leased line to the SBC to the trunk, a single provider owns the fix.

  • Always-on for AI agents too

    AI voice agents are only as reliable as the line they answer on. Auto-failover and 24x7 monitoring keep your AI-handled calls flowing as reliably as those taken by your team.

Migration, onboarding & number porting

Switch From PRI to SIP Without Downtime

Moving voice should never mean missing calls. We run the migration alongside your live setup and switch over when you are ready.

  1. 1

    Discover

    We review your current lines, call volumes, sites and bandwidth.

  2. 2

    Plan

    We confirm KYC, channel requirements and your number plan, including whether you need local numbers, a toll-free 1800 number, or both.

  3. 3

    Configure and test

    Our engineers configure the SBC and your PBX or Teams environment, then test interoperability.

  4. 4

    Run in parallel

    Your new SIP trunk runs alongside existing lines so you can verify quality before cut-over.

  5. 5

    Go live

    We cut over outside business hours and stay close with hypercare support.

Typical activationTypically 3 to 4 business days, depending on the solution.
Your numbersViva provisions your local and toll-free numbers as part of onboarding, so your new trunk is ready to take calls on go-live day.
Plan my migration

Proof

Case Studies

Illuminated residential towers across a city skyline at dusk, connected by red network lines

Real Estate

Tranzac Technologies Private Limited

Reliable AI-powered calling to qualify real estate leads across India

Tranzac needed dependable, trusted calling to qualify leads and promote projects. Viva integrated SIP Trunking with the Vapi AI calling platform using a domestic DID number, and successful trial calls showed reliable connectivity ahead of service activation.

Read Case Study
Modern gym with a reception desk, headset and screen showing a voice waveform

Fitness & Gym

Sandhu MPS Gym LLP

Dependable customer calling for a high-volume fitness business

Unreliable connectivity from previous vendors was disrupting support and member communication. Viva implemented AI-integrated SIP Trunking with a 92-series virtual number, and testing showed reliable connectivity and smoother support operations.

Read Case Study
Operations desk with dual monitors and a headset beside a world map showing connections between the US and India

Digital Marketing

Sparkline Telecom OPC Pvt. Ltd.

Stronger US call connectivity for international sales outreach

Previous vendors delivered unreliable US calling. Viva set up SIP Trunking with five US DID numbers integrated into the existing CRM, and testing showed improved US connectivity and reliable service for smoother international sales operations.

Read Case Study
Airport terminal at sunset with a phone and laptop showing travel bookings and global network connections

Travel & Tourism

Sanap Tours and Travels

Faster follow-ups on international travel enquiries

Without an international calling number, outreach to overseas website enquiries was limited. Viva implemented SIP Trunking with a dedicated international number, integrated with the existing dialer, enabling seamless outreach and faster follow-ups.

Read Case Study

FAQs

Frequently Asked Questions

A SIP trunk provider connects your business phone system, such as an IP-PBX, Microsoft Teams, or contact centre, to the public telephone network over an IP connection. Viva provides managed SIP trunking with scalable call channels, network monitoring, failover options, and 24×7 support to help keep your business communications reliable and connected.

Yes. SIP trunking is legal in India, and Viva delivers it as a Class “A” licensed ISP / ITSP / VNO.

There is no fixed limit. Capacity is sized to your requirement, and you can scale it as your call volumes change.

Yes. Viva supports number porting, so you can port your existing business numbers to Viva and use them with the Viva SIP Trunk service.

Our team will assist with the porting process and confirm the required documentation, eligibility, and timelines during onboarding.

Yes. Viva connects your trunk to Microsoft Teams through Viva Teams Connect, so your business number works inside Teams.

Yes. Viva SIP trunking can connect with various AI voice agent platforms, allowing businesses to use their preferred AI voice solution. This includes Voxcee (Voice AI by Viva) and other third-party AI voice platforms that support SIP connectivity.

The AI voice platform should support SIP-based connectivity, compatible signalling and media codecs, and the required network connectivity for voice traffic. Our technical team can validate compatibility and assist with the SIP configuration before deployment.

It supports both inbound and outbound AI-powered calls, subject to technical compatibility and applicable regulatory and compliance requirements.

Yes. Viva can provide a toll-free 1800 number alongside your SIP channels, so customers can call your business. Inbound toll-free calls are routed to your phone system, Microsoft Teams or contact centre in the same way as any other call.

It depends on the solution, but in general activation takes 3 to 4 business days.

Get in touch

Talk to a SIP Trunking Specialist

Tell us about your current setup and we will recommend the right channels, connectivity and migration plan. No obligation.

Or reach us directly
1800 572 1055  ·  info@vivadigitally.com