The merged entity would be known as 'Vodafone Idea Ltd'.
The company and a unit had received tax demands from authorities over a restructuring exercise approved by courts more than three years ago.
Justice Rajiv Shakdhar asked the telecom company and five others including Birla to file their responses within four weeks and posted the matter for further hearing on August 5.
The Cellular Operators Association of India, industry body representing GSM operators, had argued that TTSL's spectrum was allotted through the same press release issued on January 10, 2008, which led to the cancellation of 122 licences.
Birla group firm Idea Cellular Ltd and Modis-owned Spice Telecom on Friday dared the government to allocate spectrum to those mobile operators who submitted applications after them.
Aditya Birla group's Idea Cellular has signed a deal to acquire 40.8 per cent stake in Spice Communications for Rs 2,716 crore (Rs 27.16 billion).
A Delhi consumer forum has asked telecom operator Idea Cellular Ltd to pay Rs 10,000 to a person as compensation for giving a bill inflated by Rs 3.50.
A total of 41 companies had applied for the permit
Aditya Birla group on Tuesday announced it had concluded acquisition of Tata group's 49 per cent stake in Idea Cellular Ltd for Rs 4,406 crore
A consortium led by Singapore Technologies Telemedia Pte and Telekom Malaysia Bhd has bid for the one-third stake of AT&T Wireless Services Inc in Indian telecom major Idea Cellular Ltd.
Idea Cellular Ltd, a three-way joint venture company between Tata, Birla and AT&T, has launched two new tariff schemes, Chitchat Flexi and Buzz99, for its new and existing customers.
Idea Cellular Ltd has achieved financial closure of over Rs 2,225 crore for its telecom venture with a project cost of around Rs 5,000 crore from IDBI Ltd and Rabo India Finance Pvt Ltd.
Telecoms investor Aditya Birla Nuvo Ltd and retailer Future Group were among the first big names to apply for licenses to run so-called payments banks
Spectrum auction ends, brings Rs 1.09 tln to govt kitty.
New Delhi is also set to top its target of raising at least $13 billion.
The entry of the deep-pocketed conglomerate is expected to heighten competition.
Licence winners are expected to be announced by the first quarter of 2014.