Synthflow SIP trunking network guidelines
When you connect your PBX directly to Synthflow over SIP, your network must allow outbound traffic to our signalling endpoints and bidirectional RTP to our media pool addresses. Use the tables below to configure ACLs on your firewalls.
Synthflow operates three regions: Global, US, and EU. Your SIP trunk must point to the region that matches your workspace. You can find your workspace region in your account settings. Only allow-list the signalling and media addresses for your region.
Ports and transports
Point your SIP traffic toward the SIP FQDN (for automatic failover and maintenance exclusion) for your region. Also allow the media UDP range toward all media IPs listed for that region.
To find which region you reside in, navigate to “Settings” in your portal and under “Preferences” you will see “Customer Region”
Region addresses
🌐 Global
🇺🇸 US
🇪🇺 EU
Signalling
Media — allow UDP 10000–60000 to each address:
Related
- Egress IP Addresses — outbound IPs for webhooks, custom actions, and MCP
- Connect your phone system (SIP/PBX) — trunk settings, codecs, and prerequisites
- SIP Integration overview — provider tiers and supported integrations
