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The Referred-By Header which is an optional header in the REFER request provides the recipient of the REFER message, information on the originator of the request. Currently on the IMG 2020, it depends on the call flow as to whether the Referred-By header is passed or dropped. The new functionality added in F-6443 passes the Referred-By Header from the incoming to outgoing leg on a SIP to SIP call. Prior to this feature, the Referred-By Header was dropped. The new functionality encompasses both the Referred-By header in both the SIP-URI and tel-URI and is by default always enabled and cannot be disabled. Refer to the information below.
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