The Independent Communications Authority of SA (Icasa) has applied for a court interdict to stop TopTV from launching a 24-hour pornography channel, it said on Tuesday.
Icasa spokesman Paseka Maleka said the application was lodged on Monday and TopTV was given until the close of business that day to file its answering affidavit.
He said he did not know if it had filed.
TopTV was not immediately available for comment.
The case was expected to be heard in the High Court in Johannesburg on Friday.
Maleka said Icasa would hold public hearings about a pornography channel on Monday.
Last month, the Family Policy Institute said some Christian organisations planned to boycott TopTV after it announced the launch of the channel.
It said they would also boycott TopTV's advertisers and sponsors. - Sapa