TRAI direction Mandatory phase-wise adoption of 1600-Series Number

Category	Details
Circular Reference	CDSL/OPS/DP/POLCY/2026/311
Issuing Authority	Central Depository Services (India) Limited (CDSL)
Effective From	May 07, 2026
Purpose	The Telecom Regulatory Authority of India (TRAI) has mandated a strict, phase-wise transition to specific numbering series for calls made by financial entities, including Depository Participants (DPs) and Stock Brokers. This initiative is designed to help investors easily distinguish between essential service calls and marketing pitches.
Interpretation of Circular	To ensure security and transparency, all outbound calls must now follow these specific series: Call Type Number Series Example Service & Transactional 1600xx-xxxx Critical updates, OTPs, transaction confirmations, and account-related services. Promotional 140xx-xxxx Marketing, new offers, and sales-related outreach.
Impact on Sub-Brokers	Strict Compliance: All outbound calling systems must be updated to use the assigned series. Regulatory Alignment: Failure to adhere to these prefixes may result in penalties or the blocking of communication channels by TRAI.
Impact on Clients (BOs)	Enhanced Security: You can now verify the authenticity of a call based on the prefix. If you receive a “transactional” call from a standard mobile number or a non-1600 series, exercise caution. Identification: This system reduces the risk of phishing and spoofing by providing a dedicated “trust signal” for financial communications.

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