Fix ICE support detection

Ignore-this: 8205ef6a8ec081f863292e00f1a956dd

darcs-hash:20100525073024-56b4d-2b686224dc6717901bab684ac829a1344fd16e7e
Move MSRP transport setting to the account

Ignore-this: ea9e5ba66a6c3c3272dec065765ed29b

darcs-hash:20100525133243-56b4d-7148a785bd69604b2296b7a064451dfc2d971d50