Great app, it's working really well for me receiving calls but on my mobile I can't make any calls. I'm using the mobile Android app on Marshmellow, I've got it set up per the Soho66 settings.
Inbound calls are not a problem but if I try to make outbound calls on mobile network or WiFi, I just get a 408 error.
I've tried making internal VoIP calls to extension numbers and external calls. This was never a problem with other clients, so I'm pretty sure our account is OK and the settings seem to be right, but I might be missing something.
Any help much appreciated.