Conversation so far:
When was Richard Christy on the Howard Stern show?
After Richard Christy obtained the number to reach the show's answering machine from the Internet, he began to submit comical voicemail messages in 1999.

Question: Were they supposed to be voicemails he left for Howard Stern?
Self-contained rewrite: Were the voicemails submitted by Richard Christy supposed to be voicemails he left for Howard Stern?