The world's largest record companies sued the Baby Bells and the US Postal Service on Friday, alleging their phone lines and mail service allow users to "place orders for" and "ship" unlawfully copied musical recordings. The copyright infringement suit, filed in Manhattan federal court, seeks a court order requiring the defendants to block calls and packages that travel through their systems to and from the sellers of unlawful recordings. The suit says the plaintiffs have not been able to determine who the sellers are.