The documentation says for nathelper.ping_nated_only=1 that only contacts that have the
behind NAT “nat_bflag” flag in user location database set will get ping.
The current wording does not specify, if the latter ping is 4-byted UPD-packet ping, or
SIP-request-based ping.
Yesterday when I submitted the change I was behing SIP ALG. Today, without SIP ALG,
testing again, I came to the opposite conclusion compared to yesterday:
nathelper.ping_nated_only=1 does send SIP-request-based pings. It does not send 4-byte
UDP-packet pings.
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