Twilio Firewall and Port Changes

What is Twilio? 

Twilio is a 3rd party cloud communication platform that enables Flash to easily add communication capabilities like voice, text messaging, video, and email to the Flash PARCS and Valet applications. 

What's the update?

If you've been using Flash PARCS or Flash Valet then you’ve used Elastic SIP Trunking, Flex, Programmable SIP domains, SIPREC, or Voice SDKs in the past 90 days. Effective October 10, 2023, Twilio will permanently change the public media IPs and expand the port ranges for Elastic SIP Trunking calls, Programmable SIP calls, Voice SDK calls, Flex calls, and SIPREC sessions in all regions. 

If you’ve already updated your network infrastructure to allowlist (whitelist) the full IP and port ranges and made test calls for your Twilio applications, you can now enable your accounts for production traffic.

This self-service option lets you enable your accounts for production traffic before the migration finishes on October 10, 2023.

What do you need to do?

You only need to take action if your parking or valet networks are operating behind a firewall that wasn’t provided by Flash. If we provided the firewall setup then we've already taken care of this for you!

If you are operating behind your own firewall setup, please contact your IT dept or personnel that handles the network infrastructure and provide the following options. 

You have two options:

If you’ve updated your network infrastructure to allowlist the full IP and port ranges and made test calls for your Twilio applications, you can enable your accounts for production traffic immediately.  

If you don’t want to opt-in your traffic right now, you still need to update your network infrastructure to allowlist the full IP and port ranges before September 26, 2023, following the steps below:

• Add 168.86.128.0/18 to your firewall rules.
• Enable UDP from Twilio using ports 10000-60000.

Then, place test calls for your Twilio application using one of these methods:

Enable your accounts to use the new ranges for all Voice product traffic. Then, during a maintenance window, use a sub-account or production account to test calls.

Test Voice SDK and Flex calls using Twilio's Network Test tool; it now has an option that uses the new IP and port ranges.  

Next, after you have validated that your network infrastructure has been updated and that two-way audio is present on calls placed using the new IP and port ranges, you can enable your accounts for production traffic.  

Lastly, keep old IP and port ranges open in your infrastructure until October 10, 2023; these ranges won’t be able to accept or send traffic after this time, but they need to stay open until the migration is complete.

What if you don’t take action?

If you don’t take action by September 26, 2023, you will experience one-way audio and dropped calls. If you haven’t allowlisted the full IP and port ranges before the migration, all calls will fail after October 10, 2023.