What is the 1600 number series, and does my business need it?
The 1600 series is a number range the Department of Telecommunications set aside for service and transactional calls from government and BFSI (banking, financial services and insurance) entities, so customers can tell a genuine bank or insurer call from a scam. TRAI directed phased mandatory adoption in November 2025 for RBI, SEBI and PFRDA-regulated entities, with deadlines from January to March 2026, and in December 2025 for IRDAI-regulated entities, with a deadline of 15 February 2026. Other businesses generally do not need it, though TRAI opened a separate 1601 series in August 2026 for some other sectors.
Why it was created
Fraudsters routinely impersonate banks and insurers over the phone. Reserving a distinct prefix for genuine service calls from regulated financial entities gives customers a simple check: a service call claiming to be from your bank should come from a 1600-series number, and a promotional call from a 140-series number.
Who it applies to
- —Banks, NBFCs and other RBI-regulated entities: under TRAI's November 2025 direction, 1600-series numbers are mandatory for service and transaction calls, phase by phase from 1 January 2026, and 140-series numbers are used for promotional calls.
- —SEBI-regulated entities: mutual funds, asset management companies and qualified stockbrokers by 15 February 2026, and other registered intermediaries by 15 March 2026.
- —Insurers (IRDAI-regulated entities, by 15 February 2026) and pension intermediaries such as central recordkeeping agencies (PFRDA, also by 15 February 2026).
- —Other businesses: generally not covered. TRAI's August 2026 direction opens a separate 1601 series, starting with utilities and logistics companies; otherwise service calls go out on a registered calling line.
What it means for AI calling
A lender running AI-driven EMI reminders, KYC update calls or loan application follow-ups should make sure the calls leave from its allotted 1600-series numbers. That has to be arranged with the operator and the calling platform together, since the number belongs to the regulated entity, not the vendor. It also shapes customer expectations: once people learn that genuine bank service calls come from 1600 numbers, a KYC or EMI reminder from any other number looks suspicious and may be ignored or reported.
Questions to ask your vendor
- —Can the platform place calls from our allotted 1600-series numbers?
- —Are 1600-series service calls and 140-series promotional calls kept separate?
- —Do call logs show which number each call used, for audits?
How Outpero fits
Outpero provides a DLT-registered dedicated number for ₹649 a month. If you are a regulated entity that must use your own 1600-series numbers, raise it with Outpero before set-up so the calling route can be confirmed. Businesses outside financial services do not need to act on this.
Rollout dates and scope have moved more than once. Your regulator's latest circular and your operator are the authorities here.
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