Will not connect, crashes!

I have been using 3CXPhone 1.1.5 on my iPhone and it works fine with 3CX Phone System 12 SP6 (pro). I have found that it is no longer available for download. I downloaded this version of 3CX Phone for our Version 12 Sp6 system and clicked my configuration file in my email.. It configured 3CXPhone but will not connect. It just states "Connecting out of office" then "Not registered". 3CXPhone on my desktop at home will connect just fine. If I try to tell this app its "In Office" or "Out of Office" it just crashes. I hope this is fixed soon as it is unusable in its current state. IPhone 5s.

Rayzurbock about 3CXPhone for 3CX Phone System 12