LETTER ATTACHED

MAHANAGAR TELEPHONE NIGAM LIMITED (A GOVERNMENT OF INDIA ENTERPRISE) CIN L32101DL1986GOI023501 Registered and Corporate Office: Mahanagar Doorsanchar Sadan 5th Floor, 9 CGO Complex, Lodhi Road, New Delhi - 110 003. Tel: 011-24319020, Fax: 011-24324243, Website: www.mtnl.in,Email: mtnlcsco@gmail.com MTNL/SECTT/SE/2026 August 18, 2026 To, To, BSE Limited, National Stock Exchange of India Limited (NSE) Phiroze Jeejeebhoy Towers, Dalal Exchange Plaza, Plot No. C/1, G Block Bandra Kurla Complex, Street, Fort, Mumbai – 400 001. Bandra (East), Mumbai – 400 051 Scrip Code: 500108 Scrip Symbol: MTNL SUB: COMPLIANCE OF REGULATION 30 & 51 OF SEBI (LODR) REGULATIONS, 2015- DISCLOSURE OF EVENTS OR INFORMATION – DISCLOSURE OF IMPOSITION OF FINES OR PENALTIES BY TRAI - reg Dear Sir, In compliance of Regulation 30 & 51 of SEBI (LODR) Regulations, 2015 and in terms of sub-para 20 of para A of Part A of Schedule III, this is to inform you that MTNL has received order dated 17.08.2026 from Telecom Regulatory Authority of India (TRAI) for payment of financial disincentive amounting to Rs. 12,00,000/- (Rupees Twelve Lakhs only) for contravention of the provisions of regulation 4 and regulation 10 of the Standards of Quality of Service of Access (Wireline and Wireless) and Broadband (Wireline and Wireless) Service Regulations, 2024 (06 of 2024) by M/s. Mahanagar Telephone Nigam Limited for Access Service (Wireline) for the quarter ending March 2026. Details pursuant to Sub-Para 20 of Para A of Part A of Schedule III is attached herewith. Kindly take the same on record. Thanking You Yours Faithfully (RATAN MANI SUMIT) COMPANY SECRETARY DETAILS OF IMPOSITION OF FINE OR PENALTY DURING THE QUARTER IN TERMS OF SUB -PARA 20 OF PARA A OF PART A OF SCHEDULE III ARE GIVEN BELOW S. Name Nature and Date of receipt Details of the Impact on financial, No. of the details of the of direction or violation(s)/contraventi operation or other Authori action(s) taken, order, including on(s) committed or activities of the ty initiated or any ad-interim alleged to be committed listed entity, order(s) passed or interim quantifiable in orders, or any monetary terms to other the extent possible communication from the authority 1. TRAI Financial TRAI order Contravention of the Total Penalty of Rs. Disincentive of dated provisions of regulation 12,00,000/- Rs.12,00,000/- 17.08.2026 for 4 and regulation 10 of Rs 12,00,000/- the Standards of Quality Further, there is no Penalty. of Service of Access material impact on (Wireline and Wireless) the Financial, and Broadband operation or other (Wireline and Wireless) activities of MTNL. Service Regulations, 2024 (06 of 2024) by M/s. Mahanagar Telephone Nigam Limited for Access Service (Wireline) for the quarter ending March 2026.