Important Note: Current as of September 2026.
Overview
Organizations that use Boostlingo for voice and video interpretation in the United States and North America 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 US and North America voice and video services.
Domain names
If you're adding URL-based exceptions to your firewall to allow traffic to and from Boostlingo for platform usage and voice/video services, add the following:
For Boostlingo's platform: app.boostlingo.com and d3b9k3gd90kchk.cloudfront.net
For Interpret Manager: <your_branded_subdomain>.interpretmanager.com
For Boostlingo voice/video services: *.service.signalr.net
If using mobile voice/video services in the US: onesignal.com
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.
To access Twilio, your firewall should allow outgoing TCP and UDP traffic from your applications to Twilio's infrastructure, and allow the return traffic in response. Twilio never initiates a connection to the SDK applications, so the firewall should not allow externally initiated connections back into the network.
For voice
Universal: outbound TCP port 443, UDP globally.
For networks where a higher level of security is required:
US East Coast (signaling): 54.172.60.0/30 (UDP/TCP 5060, TLS 5061)
US West Coast (signaling): 54.244.51.0/30 (UDP/TCP 5060, TLS 5061)
US 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:
US East Coast (signaling): us1.vss.twilio.com (TCP port 443)
US East Coast (media servers): 34.203.254.0 to 34.203.254.255, 54.172.60.0 to 54.172.61.255, 34.203.250.0 to 34.203.251.255, and 3.235.111.128 to 3.235.111.255 (UDP/SRTP/SRTCP 10,000 to 60,000 and TCP 443 or UDP 3478)
US West Coast (signaling): us2.vss.twilio.com (TCP port 443)
US West Coast (media servers): 34.216.110.128 to 34.216.110.159, 54.244.51.0 to 54.244.51.255, and 44.234.69.0 to 44.234.69.127 (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 US, use the firewall provisioning checklist for that region instead (EU, United Kingdom, Australia, or Canada).
If connectivity issues persist after applying these exceptions, contact Boostlingo Support with a summary of the changes you made.