Voice over Internet Protocol — VoIP — has been the backbone of Indian call center operations for well over a decade. But in 2025, with evolving TRAI regulations, new compression codecs, and increasingly aggressive pricing competition, understanding VoIP properly is more important than ever for call center managers.
What Is VoIP and How Does It Work?
VoIP converts voice audio into digital data packets and transmits them over the internet rather than through traditional telephone infrastructure. For a call center, this means you can make and receive thousands of simultaneous calls using an internet connection at a fraction of the cost of traditional phone lines.
VoIP Terminology Every Call Center Manager Should Know
- SIP (Session Initiation Protocol): The most common VoIP signaling protocol. Most modern dialers and IP PBX systems are SIP-based.
- Codec: Compression algorithm used to encode voice. G.711 offers the best quality; G.729 compresses more aggressively to save bandwidth.
- Jitter: Variation in packet arrival times. High jitter means choppy audio. Must be kept below 30ms for acceptable call quality.
- Latency: Delay between speaking and the sound reaching the other party. Must be under 150ms for natural conversation.
- MOS (Mean Opinion Score): Quality rating from 1 to 5. A score above 4.0 is considered excellent; below 3.5 is problematic for professional calling.
A-Grade vs Lower Quality VoIP Routes
This is the most important concept for call center buyers. VoIP calls are routed through different tiers of infrastructure:
- A-Grade / Tier-1 Routes: Calls routed directly through premium ISP infrastructure. Consistent high quality, low latency, high reliability.
- B/C Grade Routes: Calls routed through multiple intermediaries. Cheaper, but with unpredictable quality especially during peak traffic hours.
- Grey Routes: Technically non-compliant routing. Extremely cheap but legally risky and notoriously unreliable.
Avyukta Intellicall exclusively provides A-Grade tier-1 ISP routes. The price difference is modest, but the impact on call quality and therefore your conversion rates is significant.
VoIP Packages for Indian Call Centers
Unlimited VoIP Plans
Fixed monthly fee for unlimited calling to specific destinations. Best for high-volume operations where predictable costs matter. Typical pricing: Rs 2,000 to Rs 8,000 per channel per month depending on destination.
Retail Metered VoIP Plans
Pay-per-minute pricing. Best for newer operations or campaigns with variable calling volume. Typical domestic rates: 0.5 to 1.2 paise per second.
TRAI Regulations and VoIP Compliance in India
- OSP registration for BPOs using VoIP for international processes
- DND registry scrubbing before outbound campaigns
- CLI compliance — number spoofing is illegal
- Call recording and storage requirements for regulated industries
Contact Avyukta Intellicall for a VoIP test call and pricing consultation. We will run a quality test to your specific destination countries before you commit to anything.
