Dr Arunava Dutta Chowdhury, who was till then in charge of the chest department, told media that the calls were made by a non-medical assistant superintendent.
Audio clip of Manipur CM with allegedly offensive remarks against the state's ethnic minorities have been circulating across social media since Wednesday.
The Delhi Police registered an FIR against Shamra in March 2021 following the complaint of Shekhawat on charges of criminal conspiracy, criminal breach of trust