When using Kamailio on a host with a natted address
listen=10.1.2.3 advertize 20.20.20.20
SIP options sent by NATHELPER module includes a via with the private IP address rather
than the public one. It cause OPTIONS not to be answered by UAs.
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Reply to this email directly or view it on GitHub:
https://github.com/kamailio/kamailio/issues/352