@Shahzad
I'm sorry to hear that you're experiencing issues with call forwarding. Let's troubleshoot this together. First, I would recommend checking the logs for any error messages related to the call IDs you've provided. Also, please ensure that your Vici system is configured to handle SIP REFER messages, as this could be a potential cause for the calls not being transferred properly.
If you find any error messages in the logs or if you're unsure about the SIP REFER configuration, please let me know so we can proceed with further steps to resolve the issue. If everything seems fine on your end, there might be an issue with the
forwardingPhoneNumber
attribute in the API. In that case, you could try omitting it or setting it to null or an empty string to see if that resolves the problem.
Please check these aspects and let me know what you find.