Incoming calls go to busy signal, was working

I’ve this system working for several months flawlessly, all of a sudden all incoming calls now go to a busy signal. Outgoing works fine.

I’ve tried restarting and restoring from working backups. Either case, it will answer one call, then all subsequent calls go to a busy signal.

I’ve also tried 2 different sip trunks – skype & flowroute, with only one active at a time, same result.

Any ideas?

Thanks.

Got it to work with flowroute by going to their website and pasting in the PEER details to the trunk. Still not sure why it won’t work with SkypeConnect, nothing as changed in my config for months.