[OpenSIPS-Users] What are the possible values ​​for the modparam parameter?

[이재천]

What are the possible values ​​for the modparam parameter? 
 
Such as sipping_bflag in nathelper module,
 
a tutorial in Tutorials-Distributed-User-Location-Full-Sharing show
 
modparam("nathelper", "sipping_bflag", "SIPPING_ENABLE") 
 
and other sample in https://www.ictinnovations.com/opensips-as-load-balancer-and-register-with-asterisk-servers-integeration shows
 
modparam("nathelper", "sipping_bflag", "SIP_PING_FLAG"). 
 
So I searched for what is the possible value,
 
but the manual page in 3.2.x docs(https://opensips.org/docs/modules/3.2.x/nathelper.html) shows only that
 
modparam("nathelper", "sipping_bflag", "SIPPING_ENABLE")
 
and does not shows that what is the possible values and how it acts.
 
Where can I find the information?
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