voxalot user call ring but drop few seconds later
 

My friend and I had been using voxalot user call (SIP call, 123456@voxalot) a while. our voxalot are registered at sipsorcery with a proper dial plan.

Last weekend, I added my voxalot at pbxes (and at sipsorcery same time). It's found phone ringing but it dropped in few seconds. voxalot user call couldn't setup normal talk any more.

Anyone has this experience? any fix to this problem?