Another day, another lawsuit. Apple is being sued by Brandywine Communications Technologies over multimedia voicemail in its iPhone and iPad products, reports "Gigaom" (http://macte.ch/seqwf).

In the complaint filed in the U.S. district court for the middle district of Florida Tuesday, Brandywine claims that Apple is infringing on two patents it owns related to mobile voicemail. The patents cover a "simultaneous voice/data answering machine."

Verizon, who sued Brandywine last week for patent infringement, calls the company a "a patent holding company that is in the business of enforcing patent rights through the filing of various lawsuits" -- in other words, a patent troll. "Gigaom" notes that this would put Brandywine in the same category as Lodsys and NTP, two patent holding companies that went after Apple and several other mobile device makers in recent years over both in-app purchase technology and wireless email delivery methods.