Kamailio 3.0.x - DYK-04 - switch

Match regular expressions with switch statement

See also: Kamailio 3.0.x - DYK - Table of Content

Starting with 3.0.0, you can use regular expressions to match switch cases - you have to use a '/' (slash) before case value to tell it is regular expression. For example, match dialed number against country codes:

switch($rU) {
  case /"^\+1": # calls to USA
      ...
  break;
  case /"^\+49": # calls to Germany
      ...
  break;
  default: # calls to other destinations
}

First, it is one statement construct, therefore is faster than a set of IFs:

if($rU=~"^\+1") {...}
else if($rU=~"^\+49") {...}
else {...}

Then, the config file is better structured, being easier now to manage and follow prefix based routing rules.