Referred-By

An example of the header is shown below:

Referred-By: <sip:referrer@referrer.example>;

The header properties are shown in the following table:

Header Level Action	Add	Delete	Modify	List Entries
Operations Supported	Yes	Yes	Yes	N/A

Keyword	Sub Types	Attributes
param	param	Read/Write
URL	URL Structure (see URL)	Read/Write

Below are header manipulation examples:

Example 1

Rule:

Add a Referred-By header:

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Message Type: Any

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Action Subject: header.Referred-By

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Action Type: Add

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Action Value: '<sip:refer@refer.com>'

Result:

Referred-By: <sip: sip:refer@refer.com>

Example 2

Rule:

Modify the host:

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Message Type: Any

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Action Subject: header.Referred-By.url.host

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Action Type: Add

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Action Value: 'yahoo.com'

Result:

Referred-By: <sip:refer@yahoo.com>

Example 3

Rule:

Add a new parameter to the header:

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Message Type: Any

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Action Subject: header.Referred-By.param.p1

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Action Type: Add

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Action Value: 'fxs'

Result:

Referred-By: <sip:referrer@yahoo.com>;p1=fxs