"Trai has suo-moto taken cognisance of the service of the said application (Ringo). We are examining it and take suitable decision soon," Trai Chairman R S Sharma told PTI.
Low-cost calling apps like Ringo are offering service at nearly 90 per cent cheaper rates than telecom operators.
However, domestic call services of Ringo were blocked in the same week it started operating.
Ringo is learnt to have been using Quadrant Televentures' network, a subsidiary of Videocon Telecom, for providing service. The company said it has permit for providing teleconference services and uses it along with other technology to connect calls.
Mobile operators are already facing challenges in voice business as consumers are switching to messaging apps like Whatsapp that offer free voice calls too.
Moreover, operators have started providing unlimited free calls from landline to any network across the country by charging low monthly fees.
Ringo said its services are legal and are compliant with regulations. The company is working on a "favourable resolution in due course of time", it said.
In response to a question, Ringo CEO Bhavin Turakhia said, "We have been in constant touch with TRAI and other parties, and have provided feedback and explanations as required during our discussions."
He said that Ringo will abide by any and all policies that the government comes up with.
"We welcome any progressive policy that will help consumers and the industry," he said.
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