Compound Key LRT Lookup

LRT lookup keys can be combinations of more than one key value. For example, "key=$FROM,$TO" would construct a compound key with the userinfo of the From URI followed by a comma flowed by the userinfo of the To URI.

If the request message contained:

From: <sip:[e-mail]>
To: <sip:[e-mail]>

The compound key to match this From/To pair is "1234,5678".

In the table lookup, the compound key is a single key value and there is no special treatment of the comma in key matching. The comma is simply an ordinary additional character that is matched like any letter or digit (i.e. the comma must appear in the LRT entry's "type" element data). For example, if the table were configured for "best" match-mode, the lookup key "1234,5678" would match a table entry of "1234,567", but it would not match a table entry of "123,5678".