Visual Voicemail Aastra 6735i

We purchased the commercial module FreePBX Phone Apps and after setting it up on an Aastra 6735i, the visual voicemail does not work as expected. When you press the button that has been setup for visual voicemail, you are able to see the voicemail and the details of it but when you press the play button it does not play it only places a call to the phone and on the caller id show’s voicemail. We have Freepbx version 6.12.65-28 running Asterisk version 11.18.0 and REST Phone applications version 12.0.32.

I am having a similar issue with the Aastra 6867