PopularVoice & Telephony
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Virtual numbers, IVR, call routing, recording and analytics — no PBX hardware, works from any location.
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Voice & Telephony
SIP Trunk
SIPstands forSession Initiation Protocol
Scalable IP voice channels for your PBX and contact centre
Replace PRI and analog lines with SIP voice channels over IP — scalable, resilient and PBX-compatible.
Scalable concurrent channelsDID number blocksAutomatic failoverHD voice
Share your location, users and timeline — our team will recommend the right configuration.
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Overview
What is SIP Trunk (Session Initiation Protocol)?
A SIP (Session Initiation Protocol) Trunk delivers business voice channels over an IP connection to your IP-PBX, contact-centre platform or UC system. It replaces traditional PRI and analog lines with a single, flexible link.
You can add or remove concurrent channels as call volumes change, attach DID number blocks, and configure failover so calls keep flowing during outages.
SIP trunking is the foundation for modern contact centres and AI voice platforms that need reliable, high-capacity calling.
Ideal for
Businesses with IP-PBX
Contact centres
Enterprises replacing PRI
AI voice deployments
What you get
Key Features
Flexible Channels
Scale concurrent calls up or down with demand.
DID Numbers
Direct inward dialing number blocks for teams and agents.
Failover & Redundancy
Alternate routing keeps calls flowing during outages.
HD Voice Quality
Clear calls with standard codecs such as G.711.
PBX Compatibility
Works with leading IP-PBX and contact-centre platforms.
Usage Visibility
Monitor channel utilisation and call records.
Before you buy
Buying Guide
What to evaluate, and what to share with us for an accurate proposal.
What to check before you buy
- Peak concurrent calls plus headroom
- DID, CLI and number portability needs
- Codec and network-quality requirements
- Failover and alternate routing design
- PBX / contact-centre compatibility
- Security and fraud monitoring
Share these for an accurate proposal
- 1PBX or contact-centre platform in use
- 2Peak simultaneous calls
- 3Number of DIDs required
- 4Site address for delivery
- 5Existing PRI / lines to migrate
Why it matters
Business Benefits
01
Lower Infrastructure Cost
Fewer physical lines and less hardware to maintain.
02
Scale Instantly
Add channels for campaigns, seasons or new teams.
03
Always Available
Redundant design for business continuity.
04
Future-Ready Voice
Foundation for cloud contact centres and AI voice.
Who it's for
Use Cases by Industry
Contact Centres
Centralised inbound and outbound voice.
Sales Teams
CRM-connected high-volume calling.
AI Voice Systems
SIP connectivity for voice bots and AI agents.
Multi-Location
Centralised numbering and routing.
PRI Migration
Move from circuit-based voice to IP.
Under the hood
Technical Specifications
- Protocol
- SIP over dedicated IP link
- Capacity
- Scalable concurrent channels
- Numbering
- DID blocks, CLI configuration
- Codec
- G.711 (others on request)
- Resilience
- Failover and alternate routing
Final configuration depends on feasibility and your requirement, and is confirmed after assessment.
Getting started
How It Works
STEP 1
Share Requirement
Tell us your locations, users, timeline and technical needs.
STEP 2
Feasibility & Design
We check feasibility and design the right configuration.
STEP 3
Tailored Proposal
Receive a proposal matched to your exact requirement.
STEP 4
Deploy & Support
Installation, onboarding and ongoing support.
Jargon, decoded
Key Terms Explained
Full forms of the abbreviations used on this page.
- SIP
- Session Initiation Protocol
- AI
- Artificial Intelligence
- CLI
- Calling Line Identification
- CRM
- Customer Relationship Management
- DID
- Direct Inward Dialing
- HD
- High Definition
- IP
- Internet Protocol
- PBX
- Private Branch Exchange
- PRI
- Primary Rate Interface
- UC
- Unified Communications
Compliance & Regulations
Confirm applicable Indian telecom, numbering, calling and consent requirements with the carrier before go-live.
Questions
Frequently Asked Questions
In most cases, yes. SIP delivers voice channels over IP, subject to your PBX compatibility, numbering and carrier requirements.
Coverage
Availability
SIP Trunk is available across 60+ cities in India, subject to site feasibility. Major locations include:
Delhi NCRMumbaiBengaluruPuneHyderabadChennaiKolkataAhmedabadJaipurChandigarhIndoreLucknow
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Ready to get started with SIP Trunk?
Share your requirement and our Tata Tele specialists will recommend the right solution for your business.