FreJun vs Twilio: Choosing the Right Telephony Provider for India

When we built Sreegen's telephony layer, we ran production traffic through both Twilio and FreJun for three months before making our primary provider decision. The results weren't close — but not for the reason most people expect. It wasn't price. It was the cumulative effect of dozens of small India-specific advantages that only show up at scale.

This is that comparison, based on real production data running Indian outbound campaigns.

The Indian Outbound Context

Indian outbound calling has specific technical requirements that don't apply in most western markets:

• Numbers must be scrubbed against the NDNC (National Do Not Call) registry before dialling
• Calls from unregistered headers get blocked or flagged as spam by Jio, Airtel, and BSNL
• SIP termination quality varies dramatically by operator and region — a Jio number calling another Jio number behaves differently than a Jio-to-Airtel call
• Billing in USD introduces FX risk for INR-revenue businesses
• TRAI compliance requirements change frequently; provider support for these changes matters

With this context, here's how the two providers compare.

Call Quality & Answer Rates

In head-to-head testing running identical campaigns with identical lead lists through both providers, FreJun consistently delivered better answer rates on Indian mobile numbers. Our best measurement was a 18% lower ANR (Answer Non-Response rate) on FreJun vs Twilio across 45,000 calls over 6 weeks.

The root cause appears to be caller ID reputation. FreJun's infrastructure routes calls through Indian-registered Tier-1 operator numbers, which are less likely to be flagged as "Spam Likely" by telecom spam filters. Twilio's SIP termination for India goes through international routes that get flagged more aggressively on Jio and Airtel networks.

Pricing: INR vs USD

Twilio charges in USD. At scale, running 50,000 calls/month at ~₹1.20/minute, this means:

• Every INR/USD FX movement directly impacts your cost
• GST input credit is harder to claim on USD invoices for Indian entities
• International payment processing fees apply

FreJun bills in INR with GST-compliant invoices. For Indian businesses this is a meaningful operational advantage, particularly for finance teams managing monthly budgets.

On raw per-minute rates for Indian numbers, FreJun is approximately 15–20% cheaper than Twilio after accounting for INR conversion. The gap widens at higher volumes where FreJun's enterprise pricing is negotiable in INR.

TRAI & DND Compliance

This is where the gap is most visible. FreJun has built-in NDNC scrubbing APIs and maintains compliance with TRAI's Telecom Commercial Communications Customer Preference Regulations (TCCCPR). Their support team understands Indian regulatory requirements and responds in IST business hours.

Twilio's compliance tooling is built for US/EU markets. TCCCPR compliance on Twilio is a DIY exercise — you build the integration layer, monitor TRAI updates, and handle the legal exposure yourself. For a small team, this is non-trivial operational overhead.

Latency & Voice Quality

For AI calling — where the STT-LLM-TTS pipeline already adds 600–900ms of processing latency — telephony latency is a critical variable. Noticeable call delay makes AI conversations feel robotic and kills engagement.

In our benchmarks, FreJun's India-hosted infrastructure added ~35–45ms of SIP latency. Twilio's India routing added 90–140ms. That additional 50–100ms compounds: combined with processing latency, Twilio calls felt perceptibly less natural in conversational turn-taking. Contact rate and sentiment scores were both slightly lower on Twilio calls as a result.

Developer Experience & API

Twilio wins this category clearly. The API documentation is best-in-class. The developer community is massive. If you're building a complex custom telephony product, Twilio's ecosystem has no peer.

For standard AI calling use cases on Sreegen, however, you're not writing Twilio code directly — the platform abstracts the telephony layer. The developer experience advantage doesn't surface for end users running campaigns.

The Verdict for Indian Outbound AI Calling

FreJun is the right choice for Indian outbound AI calling at any volume above ~5,000 calls/month. The combination of better answer rates, INR billing, built-in TRAI compliance, and lower India-specific latency outweighs Twilio's superior developer experience for the vast majority of use cases.

Twilio makes sense if: you need to run campaigns across multiple countries including India (Twilio's global reach is unmatched), or you're building a custom multi-tenant telephony product where API flexibility is paramount.

Sreegen uses FreJun as our default production provider for all Indian campaigns. We maintain Twilio capability for international use cases and as a failover.