Additions and changes to the Twilio platform
In 2H 2023 Twilio will be updating the media IPs and port ranges for Flex calls in all regions. We will be moving from a per-region IP range allocation to a single global range; 188.8.131.52/18. Additionally, we will be expanding the media port range from 10000-20000 to 1024-65535.
We are making this change to provide flexibility, reliability, and scalability. There is no action required at this time, and we will provide a more precise timeline approximately six months before the change. At that time you will need to update your network infrastructure to ensure that you have whitelisted the full IP and port ranges. Failure to do so will result in one-way audio and dropped calls.