---
title: Protocol validation rules · Cloudflare One docs
description: Magic Firewall supports Session Initiation Protocol (SIP) to
  inspect traffic validity and enforce a positive security model.
lastUpdated: 2025-10-30T17:13:08.000Z
chatbotDeprioritize: false
source_url:
  html: https://developers.cloudflare.com/cloudflare-one/traffic-policies/packet-filtering/protocol-validation-rules/
  md: https://developers.cloudflare.com/cloudflare-one/traffic-policies/packet-filtering/protocol-validation-rules/index.md
---

Magic Firewall supports [Session Initiation Protocol (SIP)](https://datatracker.ietf.org/doc/html/rfc2543) to inspect traffic validity and enforce a positive security model.

You can use the `sip` field when creating a rule to determine if packets are valid SIP Layer 7 (L7) protocol. Refer to [Magic Firewall fields](https://developers.cloudflare.com/cloudflare-one/reusable-components/packet-filtering-fields/), specifically the `sip` field, for more information on this topic.

Contact your account manager if you need Magic Firewall to support additional protocols.
