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What is Referred – By Header Field in SIP?

The Referred-By header field is a non-compulsory header field in a REFER request and a request triggered by a REFER.

1. It provides the receiver of a triggered request with information that the request was produced as a result of a REFER and the originator of the REFER.

2. An unsigned Referred-By header field may be discarded with 429 Provide Referrer Identity response code.

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