[SR-Users] What is Attribute Value Pair (AVP) ?

[Mahmoud Ramadan Ali]

Hiiii everyone,
Forgive me for such simple question but i'm newbie to Kamailio. i was
reading about the dispatcher module
http://www.kamailio.org/docs/modules/4.2.x/modules/dispatcher.html#dispatcher.p.db_url
and i want someone to explain to me in a simple way what is AVP , for
example the AVP in the *modparam("dispatcher", "grp_avp", "$avp(dsgrp)")*
and what the "dsgrp" represents and how to configure the AVP values ...
Kinda Regards
Thanks in advance...
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