I have just upgraded our in house system from 9.0 SP5 to 9.1 SP1. All is working except for the Mobility VOIP which was working on 9.0. On the IPhone app the Available is green, the circle is green and the handset is green but there is no speech. Internally it works as I have split DNS and there is speech. But externally no speech but all icons show green. I have all the correct ports forwarded to the IXP apps sever and Ip office. As I said working ok on 9.0 and soon as I upgraded to 9.1 now not working. Have they introduced something that I have missed.