Apple registered it in September 2006, three months before Cisco tried to revive their Trademark. Prior to that, the company Cisco bought had an iPhone that they discontinued in 1999 or 2000.
I'm not saying it's 100% certain Cisco has lost this battle (I believe they have, however) but it's definitely not a clear-cut victory for them either.
Just to clarify, here's a timeline of events:
1997, Infogear releases the iPhone.
1999, Infogear trademarks the term iPhone.
2000, Cisco buys Infogear. They discontinue the iPhone.
2005, The iPhone trademark expires. Cisco has 6 months to renew it.
2006, May, Two weeks before the six months is up, Cisco renews the trademark using the photo I posted earlier.
2006, September, Apple registers the trademark iPhone through a dummy company called Ocean Telecom Services LLC.
2006, December, Cisco rebrands a Linksys phone the iPhone.
2007, January, Apple announces the iPhone.
The thorn in Cisco's side is the fact that they didn't actually have a product called iPhone for the entirety of their ownership of the trademark and didn't release one inside the renewal period. They now have to go into court defending a trademark after the fact when they didn't adequately defend during it's lifetime.