[SR-Users] What is q-value ??

[aawaise]

There is a mention of highest "q value" in documentation of registrar
module's function "lookup(domain [, uri])".
Can some one please explain what this "q value" is ??
It is used in 4.2 section of following link.
http://kamailio.org/docs/modules/stable/modules/registrar.html#idp1976344

Any help will be appreciated. Thanks. 



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