---
title: "Ports and protocols used in SIP applications"
url: "https://help.monema.com/en/article/ports-and-protocols-used-in-sip-applications"
language: "en"
last_updated: "2025-11-28T09:13:07.618Z"
---

# Ports and protocols used in SIP applications

Desktop terminals and others

The **router** or **firewall** must not block the following ports to ensure smooth communication without interruptions or other problems.

-   **Disable SIP ALG on routers** \- It may interfere with SIP traffic.
-   **5060** **UDP** \- BLF Open.
-   **5080** **TCP** **and** **UDP** \- SIP signaling.
-   **5081 TLS (encrypted)** **TCP** \- SIP signaling.
-   **3478** **UDP** **(STUN)** \- Allows NAT clients to find their public IP address.
-   **10000-20000** **UDP** \- RTP and SRTP (encrypted) audio packets.

Contact your internet provider or IT specialist if you do not know how to perform this operation safely.