Find out daily problem where I loose incoming calls

I hope you can help.

Daily our freepbx system is loosing the ability to receive incoming calls until I reboot and then it works until the next day and then it will stop receiving incoming calls.

Outgoing always worl.

I know there is log files but can anyone help me where to start to find this error?

I don’t really understand which log file to look for

Many thanks

Is the system behind NAT?

Does your ISP change your address?

Do you register with them. If so, what is the re-registration inteval?

Yes

Thanks

No - Public IP stays the same on reboot of router

I cannot find re-regsiter interval on my freepbx -

When I go to Connectivity / Trunks / I don’t have any advanced settings

Connectivity → Trunks, click the pencil button for your trunk, select pjsip Settings → Advanced, edit Expiration as desired.

Did you accidentally create a chan_sip trunk, instead of pjsip?

Most likely - Can I change this to pjsip?

Unfortunately, you’ll have to delete it and set it up again.