Important Note: Current as of September 2026.
Overview
Organizations that use Boostlingo for voice and video interpretation in the EU sometimes need to update their firewall configuration to allow connectivity. This checklist lists the domain names, ports, and IP address exceptions to add for Boostlingo's EU voice and video services.
Domain names
If you're adding URL-based exceptions to your firewall to allow traffic to and from Boostlingo for voice and video services, add the following:
For the Boostlingo platform: eu.boostlingo.com and d3an2jhz9fnx5p.cloudfront.net
For Interpret Manager: <your_subdomain_name>.eu.interpretmanager.com
For Boostlingo voice/video services: *.service.signalr.net
IP address ranges and ports
If your organization uses IP-based exceptions with coordinating ports instead of URL-based exceptions, add the IP address ranges and ports below to your firewall exceptions list for connectivity to Boostlingo's voice and video services.
For voice
Universal: outbound TCP port 443, UDP globally.
For networks where a higher level of security is required:
Europe Ireland (signaling): 54.171.127.192 to 54.171.127.195 (UDP/TCP 5060, TCP 5061)
Europe Frankfurt (signaling): 35.156.191.128 to 35.156.191.131 (UDP/TCP 5060, TCP 5061)
Media Servers: 168.86.128.0/18 (UDP 10,000 to 60,000)
For video
Universal: outbound TCP port 443, UDP globally.
For networks where a higher level of security is required:
Europe Ireland (signaling): ie1.vss.twilio.com (TCP port 443)
Europe Ireland (media servers): 52.215.253.0 to 52.215.253.63, 54.171.127.192 to 54.171.127.255, 52.215.127.0 to 52.215.127.255, and 3.249.63.128 to 3.249.63.255 (UDP/SRTP/SRTCP 10,000 to 60,000 and TCP 443 or UDP 3478)
Europe Frankfurt (signaling): de1.vss.twilio.com (TCP port 443)
Europe Frankfurt (media servers): 52.59.186.0 to 52.59.186.31, 18.195.48.224 to 18.195.48.255, and 18.156.18.128 to 18.156.18.255 (UDP/SRTP/SRTCP 10,000 to 60,000 and TCP 443 or UDP 3478)
Video (additional): sdkgw.us1.twilio.com (TCP port 443)
Prior to Android 5.9.0, iOS 3.5.0, and Javascript SDK 2.5.0, also required: ecs.us1.twilio.com (TCP port 443)
Important Note: The following IP addresses no longer need to be whitelisted after October 11, 2023:
54.244.51.0 to 54.244.51.255 (UDP 10,000 to 20,000)
54.172.60.0 to 54.172.61.255 (UDP 10,000 to 20,000)
34.203.250.0 to 34.203.251.255 (UDP 10,000 to 20,000)
Next steps / Getting more help
If your organization also operates outside the EU, use the firewall provisioning checklist for that region instead (United Kingdom, Australia, Canada, or US).
If connectivity issues persist after applying these exceptions, contact Boostlingo Support.