I am failing to register my number with airtime sharing. It is displaying forbidden (403). I topped up my number today but it says 263 not ready in red. I use an ios device.
Hello,
Please find the meaning of this error, here: https://www.zoiper.com/en/support/home/article/60/SIP_403_-_Forbidden
You need to contact your VoIP service provider for further information and clarification of the issue.