If I enable dialog module Kamailio will fail to start with following error:
ERROR: dialog [dialog.c:498]: mod_init(): no dlg flag set!!

In the documentation this parameter is set to 4 as an example:
modparam("dialog", "dlg_flag", 4)

But no comments made as to why number 4 is used, which numbers are possible to use and most importantly - why such default value is chosen?

In any case - module should use default which does not break server's configuration.

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