"I hope Mr Nel relayed to you my apology, I did not realise the consequences," Roux said in the High Court in Pretoria. He was referring to prosecutor Gerrie Nel.

Oscar Pistorius's lawyer Barry Roux on Thursday apologised to a State witness for reading his cellphone number out in court.

"I hope Mr Nel relayed to you my apology, I did not realise the consequences," Roux said in the High Court in Pretoria. He was referring to prosecutor Gerrie Nel.

"Thank you very much. Apology accepted," the witness, Charl Johnson replied.

Johnson told the court this week that he was inundated with calls after Roux read his number out on Tuesday.

One was from a person accusing him of lying in court. He subsequently had to keep his phone switched off.

Roux continued questioning Johnson about notes he and his wife made about the screams and shots they said they heard from Pistorius's townhouse in the early hours of February 14 last year.

Pistorius is accused of the murder of his girlfriend Reeva Steenkamp.

He is also charged with illegal possession of a firearm and ammunition, and two counts of discharging a firearm in public.

He allegedly fired a shot from a Glock pistol under a table at a Johannesburg restaurant in January 2013.

In September 2010 he allegedly shot through the open sunroof of a car with his 9mm pistol while driving with friends in Modderfontein.