I have an asterisk system behind NAT, and need to connect to public PSTN originators via SIP or IAX2, but don't have the option of forwarding any ports (4569, 5060, etc) to the asterisk system. However, the NAT system does properly establish transient UDP forwarding on the basis of outgoing connections, so is it possible to configure asterisk to send frequent keepalive UDP packets (say every 30 seconds) from ports 4569 and 5060 to the PSTN originators in order to keep the NAT system's transient forwarding in effect, so that when the PSTN originator receives inbound calls and attempts to contact my asterisk system, the NAT system won't drop the packets?
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