I just register push server. However if I enable the PUSH service, I could not dial out and also get any incoming call. I try all the setting in website. However it does not work.
If I disable the PUSH, everything works fine.
Try using our contact form(https://www.zoiper.com/en/contact), so we can check what could be happening.
When sending your request, don't forget to fill your SIP account username/ hostname and time/ date when you made your last call attempt, so we can search the logs.