What do the -P, -S, -T and -G suffixes on SMS headers mean?

Under TRAI’s February 2025 amendment to the commercial communication rules, the sender name (header) that customers see ends with a suffix showing the type of message. This lets recipients tell at a glance whether a message is a promotion or an important alert.

Suffix	Message type	Examples
-P	Promotional	Offers, discounts, marketing campaigns
-S	Service	Order and delivery updates, balance alerts, warranty and safety information
-T	Transactional	OTPs and transaction confirmations sent right after a customer’s action
-G	Government	Messages from Central or State Government bodies or their authorised agencies

For example, a customer might see SGCSMS-S on a delivery update and SGCSMS-P on an offer from the same business.

What this means for you #

• The suffix comes from your template’s category. Registering each template under the correct category is what shows customers the right suffix.
• Use the right category for each message. A promotion registered as a service message risks complaints and action against your registration, and customers learn to trust “-S” and “-T” messages more.
• Keep sending with your registered header as usual. Contact support if you’re unsure how the suffix applies to your account.

To choose the right category, see Which category should I register my DLT template under?

Official source: TCCCPR (Second Amendment) Regulations, 12 Feb 2025.