The nathelper module sends nat keepalive only for UDP contacts. It is how it was
developed.
If you look for alternatives for TCP, write to sr-users(a)lists.kamailio.org, there might be
some ideas to try to do in the config file. However, this is the tracker for bugs in the
code, not discussions about using kamailio or building config files. So such discussion
doesn't belong here.
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