Hi! currently ourproblem is this, our VoIP provider sends to us the Trunk config in this way:
User: 87800345 (in example)
password: pass
but them in their system are putting a local DiD for receive calls ie: 5512043392, that DiD its not in the setup then the problem that we are having is when we are setting up the incoming call it is getting 408 / 480 messages from SIP and we are sending a logfile for someone can help us via teamviewer to setupthe trunk line
I am trained by fusion PBX developer in admin and advanced level administration. I run my own telephony company. currently I serve as level 3 tech for an ITSP and perform similar functions for them, and I do this every day.
I would analize sip messaging, configure did for I found traffic and ensure everything is in good working order.