[SR-Users] How to find whether or not certain header exists?

[Allen Zhang]

Hi,

If I normally receive a INVITE that has a header 'aaa' with value 'bbb', but it's possible that some INVITEs don't have this header.
How do I determine in the config file if the header exists?
To check the value of the header I do if($hdr(aaa) == "bbb"). But what if the header doesn't exist?

Cheer,
Allen


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