According to the fractured English of dead-frog.com:
Youngman acted as his own manager for many years, with his personal number in the New York Yellow Pages. He would happily taking on any gig that met his fee and appeared anywhere from banquet halls to conventions to night clubs. Youngman was renowned for booking secondary gigs while at a venue. He’d negotiate to do a few minutes a a bat mitzvah or wedding, sometimes when they were already in progress, in exchange for anywhere to $100 - $500 cash.
In the 1970s, Youngman had a dial-a-joke phone line, where people could call in and hear the comic spit several one liners in a single minute.