Checking your service, there appears to be no fault that can affect both incoming/outgoing calls.
We recommend having a read of these community articles, which may help with your concern:
If the issue persists, let me know of your best time to receive a call so we can have a member of our Tech Team to perform troubleshooting along with you.
Are you still having issues with the phone service? Please send me a Private Message with your best contact number and preferred time.
I can make phone call but I can't receive any call as it keeps giving busy dial tone. Internet is working fine.