You have to load and configure dialog module.
This kind of questions should be addressed to sr-users(a)lists.sip-router.org mailing list,
being Kamailio admin question related to config rather than a bug in source code. I am
closing this issue, if you need further clarification, write an email to mailing list.
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Reply to this email directly or view it on GitHub:
https://github.com/kamailio/kamailio/issues/347#issuecomment-144035585