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What is Route Header Field in SIP?

The Route header field is often used to give routing information for requests.

RFC 3261 introduces two types of routing: strict routing and loose routing, which have the same meaning as the IP routing modes of the same name.

1. In strict routing, a proxy must use the first URI in the Route header field to rewrite the Request-URI, which is then sent.

2. In loose routing, a proxy does not rewrite the Request-URI, but either sends the request to the first URI in the Route header field or to another loose routing element.

3. In loose routing, the request must route throughout every server in the Route list before it may be routed based on the Request-URI.

4. In strict routing, the request must only route through the set of servers in the Route header field with the Request-URI being rewritten at each hop.

5. A proxy or UAC can notify if the next element in the route set helps loose routing by the existence of an lr parameter.

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