When Synthflow connects to your infrastructure (webhooks, custom actions, MCP servers, or any other outbound HTTP request), traffic originates from a fixed set of IP addresses. If your network requires an allow-list for inbound connections, add the addresses below for your region.
Synthflow operates three regions: Global, US, and EU. Only allow-list the addresses for the region your workspace is in. You can find your region under Settings > Preferences > Customer Region in the Synthflow portal.
These addresses cover platform-level outbound traffic (API callbacks, webhooks, MCP, custom actions). For SIP signalling and RTP media addresses, see SIP Trunking Network ACL.