A spokesman for Pacquiao's promoter blamed technical difficulties for the cancellation, partly due to the large number of boxing writers and broadcasters who were on the call.
"There were so many calls the system blew," Top Rank spokesman Lee Samuels said. "We've used the same company for 10-15 years and this is the first time this has happened."
Pacquiao was on the call from Los Angeles for what was supposed to be his last question-and-answer session before he arrives in Las Vegas next week for the May 2 fight. But the only question he answered was from a Top Rank PR person about how training camp was going, to which Pacquiao responded "very good."
Promoter Bob Arum, who was also on the call, then got frustrated when the first caller in the queue wasn't someone who was supposed to be in line to ask a question.
"Let's reorganize and do this call some other time, please," Arum said.
Samuels said there were so many people calling in that some were unable to get on the call. He apologized and said it would be rescheduled.
Mayweather is supposed to have his own conference call Wednesday.