Hi VishalKumar2244,
My name is Merlina, I am an Independent Advisor and a user like yourself. I'm Sorry to know that you're having this issue. I apologize for the inconvenience. I'll do my best to help you.
If this issue only happens when using SIP calling apps like Zoiper and Microsip, the error may be caused by these apps.
I suggest:
- Clear app cache
- Uninstall and reinstall the app
- After each step test it to check if already working.
Let me know any questions. Thank you.