Problem

Phone calls from Everbridge to contacts in China fail and the call result is:

Not Delivered – Downstream Communication Error
or
Not Delivered - Voicemail Hung Up

Root Cause

At a minimum, calls to China should adhere to Caller ID requirements called out in the Solution section below.

However, even with proper Caller ID in place, China has very restrictive requirements, regulations, and filtering for voice calls. As a result, voice calls from Everbridge Suite going to China may be blocked even when best practices and recommendations are followed. Blocked calls will typically generate a "Not Delivered - Downstream Communication Error" or "Not Delivered - Voicemail Hung Up". We highly recommend being multi-modal and not relying solely on voice calls to reach your contacts in China.

Solution

Ensure the Caller ID is from that of the originating country. For example, if you use everbridge.net, then your calls to China should be configured with a valid +1 phone number. If this does not solve the issue, see knowledge article EBS: Troubleshooting Known Voice Call Limitations and Anomalies in Everbridge Suite.

As an alternative, consider using other delivery paths such as email and SMS. Such delivery paths are not affected by these regulations. Per the Everbridge CARES Best Practice Program described in knowledge article EBS: Everbridge CARES Best Practice Program, it is encouraged to use multiple delivery paths to reach contacts.