IP Office 9.0 one x mobile preferred VoIP mode: VoIP registration failed 8

[sq12345]

Hi Guys, does anyone try the one x mobile one x mobile preferred VoIP mode?

I get the error:

VoIP registration failed

The application is operational with the exception of the VoIP feature which is experiencing problems registering with the server. (error 13:0)

I have HTC ONE android.

 

[jb1990]

Hi I am new to IPO & to this forum, hope someone will help me. I was reading this thread and found my problem mentioned @jglongisland "When we make a call, it rings on the other end, but as soon as that user picks up the iPhone user gets a quick busy and it shows "Call Failed." Any body have come across this issue and resolved this?