The Telecom Regulatory Authority of India (Trai) may extend the deadline to whitelist URLs (Uniform Resource Locators), APKs (Android Package Kit), or OTT (Over The Top) links - through which it intends to curb their misuse -is likely to be extended by 30 days as only over 3,000 registered senders (businesses) have complied, officials indicated.According to Trai officials, over 3,000 registered senders have whitelisted more than 70,000 links, but many more (thousands of others) are yet to comply with the directive as the mandatory norms are set to come into effect from October 1.