[Mbai2]

I don't have an iPhone so I'm only speculating here. The problem is that voicemails on the iPhone aren't traditional VM messages. They are actually MP3 files downloaded from the visual VM server. When you select a message, it doesn't treat it as a phone call and treats it as a media file instead. Because of this, it won't invoke the CTS's handsfree system and that is why voicemails don't play over BT. If you have a normal voicemail access number (usually your own phone number), dial that to check your voicemail throught the CTS.