if Media5fone is a SIP softphone, then yes, it will work.
Will my iptel SIP work with iPhone 3G and iPhone app Media5fone?
-- Daniel-Constantin Mierla Kamailio (OpenSER) Advanced Trainings Nov 22-25, 2010, Berlin, Germany Jan 24-26, 2011, Irvine, CA, USA http://www.asipto.com