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title: Synthflow SIP trunking network guidelines
slug: sip-trunking-acl
description: Firewall and ACL rules for SIP signalling and RTP media when trunking into Synthflow by region (Global, US, EU).
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For a complete page index, fetch https://docs.synthflow.ai/llms.txt. For full documentation content, fetch https://docs.synthflow.ai/llms-full.txt.

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 ACL's on yoyur firewalls.

## Ports and transports

| Traffic           | Protocol | Port range      | Purpose                                                 |
| ----------------- | -------- | --------------- | ------------------------------------------------------- |
| 📞 SIP signalling | UDP, TCP | **32681**       | SIP over UDP/TCP                                        |
| 📞 SIP signalling | TLS      | **32682**       | SIP over TLS                                            |
| 🔊 Media (RTP)    | UDP      | **10000–60000** | RTP/RTCP between your network and Synthflow media nodes |

Allow the signalling ports toward the SIP FQDN (or resolved IPs) for your region. Allow the media UDP range toward **all** media IPs listed for that region.

## 🌐 Global

### 📞 Signalling

| FQDN               | IP (allow list) | UDP   | TCP   | TLS   |
| ------------------ | --------------- | ----- | ----- | ----- |
| `sip.synthflow.ai` | `34.138.86.8`   | 32681 | 32681 | 32682 |

### 🔊 Media

✅ Allow **UDP 10000–60000** to each media address:

| Media IP        |
| --------------- |
| `34.73.190.14`  |
| `35.237.117.4`  |
| `34.148.74.207` |

## 🇺🇸 US

### 📞 Signalling

| FQDN                  | IP (allow list)                                     | UDP   | TCP   | TLS   |
| --------------------- | --------------------------------------------------- | ----- | ----- | ----- |
| `sip.us.synthflow.ai` | `35.237.42.43/32, 34.139.4.161/32, 4.138.180.50/32` | 32681 | 32681 | 32682 |

### 🔊 Media

✅ Allow **UDP 10000–60000** to each media address:

| Media IP        |
| --------------- |
| `34.74.219.233` |
| `34.73.16.58`   |
| `34.74.102.178` |

## 🇪🇺 EU

### 📞 Signalling

| FQDN                  | IP (allow list)                                         | UDP   | TCP   | TLS   |
| --------------------- | ------------------------------------------------------- | ----- | ----- | ----- |
| `sip.eu.synthflow.ai` | `34.185.212.150/32, 34.89.186.33/32, 35.242.217.198/32` | 32681 | 32681 | 32682 |

### 🔊 Media

✅ Allow **UDP 10000–60000** to each media address:

| Media IP         |
| ---------------- |
| `34.89.251.213`  |
| `35.198.108.150` |
| `34.141.20.211`  |

## Related

* [Connect your phone system (SIP/PBX)](/connect-your-phone-system) — trunk settings, codecs, and prerequisites
* [SIP Integration overview](/about-sip) — provider tiers and supported integrations