Unknown Header
An Unknown header is a SIP header that is not included in this list of supported headers. An example of the header is shown below:
MYEXP: scooby, doo, goo, foo
The device's Message Manipulation feature supports up to three occurrences of a given unknown header in a single message. If there are more than three of the same header, the device removes the extras.
The header properties are shown in the following table:
Header Level Action |
Add |
Delete |
Modify |
List Entries |
---|---|---|---|---|
Operations Supported |
Yes |
Yes |
Yes |
3 |
Keyword |
Sub Types |
Attributes |
---|---|---|
N/A |
N/A |
N/A |
Below are header manipulation examples:
Example 1 |
Rule: |
Add a custom header to all messages:
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Result: |
myExp: scooby, doo, goo, foo |
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Example 2 |
Rule: |
Create a new header called "media", whose value is a concatenation of the time in the Session-Expires header, followed by "000", followed by ";refresher=", followed by "1" or "2", depending on whether the refresher parameter in the Session-Expires header has the value 'UAC' or 'UAS':
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Result: |
media: 3600000;refresher=1 |
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Example 3 |
Rule: |
Create lists of Unknown headers:
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Result: |
myExp: scooby, doo, goo, foo |
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Example 4 |
Rule: |
Remove the SIP header 'colour' from INVITE messages:
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Result: |
The colour header is removed. |