On Wednesday, a court in Delhi rejected the bail applications of Swan Telecom Director Vinod Goenka and Unitech Wireless Managing Director SanjayChandra.
News channel CNN-IBN broadcast what it said was a conversation between Mr Singh and SanjayChandra, the managing director of Unitech, a property company.
Telenor, which holds a two thirds stake in Unitech Wireless, has asked that SanjayChandra step down as chairman of their telecom joint venture and that Unitech should appoint a replacement.