If your business calls customers in India, from a sales team, a service desk or a reminder line, TRAI’s rules decide which calls you may make, from which numbers and to whom. Getting this wrong can mean complaints, blocked headers and, in serious cases, your telecom connections being cut. This guide explains the TRAI rules for business calls in plain words: the TCCCPR framework, the DND register, DLT registration, and the 140 and 1600 number series. It is a practical overview, not legal advice, and the rules change often, so always check the latest TRAI and DoT notifications with your telecom provider.
The framework: TCCCPR 2018
The main rulebook is the Telecom Commercial Communications Customer Preference Regulations, 2018 (TCCCPR), issued by the Telecom Regulatory Authority of India. It covers commercial calls and SMS, and it rests on three ideas:
- Customer preference: every mobile user can say what kind of commercial communication they are willing to receive, through the Do Not Disturb (DND) register.
- Consent: businesses need the customer’s consent for many kinds of messages, and that consent has to be recorded.
- Registration: businesses that send commercial communication, and the telemarketers who work for them, are registered with telecom operators on a shared platform called the DLT (Distributed Ledger Technology) platform.
TRAI has amended and tightened these regulations several times since 2018, so treat the summary below as a starting point.
Three kinds of business calls
TCCCPR sorts commercial communication into broad types. The type decides what rules apply.
| Type | What it is | Typical example |
|---|---|---|
| Promotional | Offers, sales pitches, marketing | “New home loan offer at a special rate” |
| Transactional | Information the customer needs right now about a transaction they started | OTP, account debit alert |
| Service | Updates about a product or service the customer already uses | Delivery update, appointment reminder, policy renewal notice |
Promotional calls are the most restricted. They must respect the DND register and come from the series of numbers set aside for promotional calling. Service and transactional calls are allowed to customers with a relationship, but they must not be used to slip in a sales pitch.
The DND register (NCPR)
The National Customer Preference Register, usually called DND, lets any mobile user block promotional calls and SMS, fully or by category such as banking, real estate or travel. Users register by calling or texting 1909 or through their operator’s app.
For a business, this means:
- Do not make promotional calls to numbers on DND unless you have valid, recorded consent that the rules accept.
- Customers can complain about unwanted calls, and complaints against your numbers or your telemarketer count against you.
- A clean consent record protects you. Collect it in writing, on your website or app, or on WhatsApp, and store it with the date and source.
DLT registration
Businesses that send commercial communication register as principal entities on the DLT platform run by telecom operators. SMS senders also register their headers (sender IDs) and message templates there, and consent records can be kept on it. Telemarketers that call or message on your behalf must also be registered.
If you use a call centre partner or an AI calling vendor for any promotional activity, ask them to show their registration. Your brand carries the risk if they break the rules.
The 140 series and the 1600 series
To help people tell business calls apart from personal calls, numbers are now split by purpose:
- 140 series: numbers starting with 140 are set aside for promotional voice calls by registered telemarketers. A customer who sees a 140 number knows it is a marketing call.
- 1600 series: DoT has introduced numbers starting with 1600 for service and transactional calls from regulated entities such as banks, insurers and other financial institutions regulated by RBI, SEBI, IRDAI and PFRDA. A customer who sees a 1600 number knows it is a genuine service call from a regulated institution.
TRAI has also directed operators to act against unregistered senders who use ordinary 10-digit numbers, SIP trunks or PRI lines for promotional calls. Connections of repeat offenders can be disconnected and the sender blacklisted. So a SIP trunk bought for your office is for your business calls, not for bulk marketing.
What this means for your phone system
Most rules are about who you call and why, not about the PBX itself. But the way you set up your calling makes it much easier to stay compliant.
- Keep promotional and service calling separate. Use the right number series for each purpose and do not mix sales pitches into service calls.
- Call people who expect your call. Customers who left a missed call, filled an enquiry form or asked for a callback are the best calls you can make. See missed call management.
- Let agents dial, one call at a time. In a human-first contact centre, agents work their own leads and callbacks with click to call. Voxdial Contact Center records every call and the outcome, so you have a clear trail of who was called and why.
- Prefer WhatsApp for reminders and updates where customers have opted in. Template messages on the WhatsApp Business API have their own consent and quality rules; see WhatsApp quality rating and opt-in.
- Record consent and keep it. Store where and when each customer agreed, along with the call recording where relevant. Recordings are personal data too, so read DPDP Act and call recording.
- Block spam reaching you as well. Your own lines get unwanted calls too; see how to block spam calls.
Common mistakes
- Using a regular mobile or SIP number for promotional campaigns.
- Treating “they bought from us two years ago” as consent for every future offer.
- Letting a vendor make calls in your name without checking their registration.
- Adding an offer to the end of a service call.
- Not keeping records of consent, so a complaint becomes your word against the customer’s.
Where BitVoice fits
BitVoice builds the IP PBX, contact centre and AI voice agents that businesses use for service calls, callbacks and customer support. We set up human-first calling, with agents answering first and an AI voice agent only covering busy times or after hours, and we keep promotional calling a decision for you and your compliance team. For regulatory questions, speak to your telecom provider or legal adviser.
Want a calling setup that is easy to keep within the rules? Talk to BitVoice.
FAQs
What is TCCCPR?
The Telecom Commercial Communications Customer Preference Regulations, 2018, issued by TRAI. They govern commercial calls and SMS in India, including the DND register, consent and registration of senders and telemarketers on the DLT platform.
What are 140 numbers used for?
Numbers starting with 140 are set aside for promotional voice calls by registered telemarketers, so customers can recognise marketing calls before answering.
What is the 1600 number series?
It is a number series introduced by DoT for service and transactional calls from regulated entities such as banks, insurers and other financial institutions, so customers can trust that the call is genuine.
Can I make service calls to customers on DND?
Service and transactional calls to existing customers are treated differently from promotional calls, but they must stay genuine service calls. Check the current TRAI rules for your case; this guide is not legal advice.
