The Times of India and PTI quoted industry sources as saying the conditions are attached to the legal cases Suntela, unit of Sweden's Telia, is involved in with a customer.
The case may have a bearing on Suntel's valuation, which MTNL is trying to cash in on.
The official declined to put a timeframe on when it would be in a position to finally clinch the deal.
It is a very long process, the details of the purchase are being discussed at present and MTNL cannot take any chances since it is a big transaction and the company is a listed PSU, the news reports said.
Therefore, putting a timeframe is difficult, said the official.
Two other companies are also in the fray to acquire Suntel.
MTNL, which is believed to have submitted the bid to acqu