To be precise, the current wording:

If this parameter is set to 1 then only contacts that have the behind NAT “nat_bflag” flag in user location database set will get ping.

If it is 0 and sipping_bflag is not set, then the 4-bytes UDP ping is sent to all contacts. If it is 0 and sipping_bflag parameter is set, then SIP-request-based pinging is sent to all contacts.

for me implies, that sipping_bflag is relevant when ping_nated_only=1, and irrelevant when ping_nated_only=0.


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