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I try it, but nothing changed:
WAN TCP/UDP 5060 - 5069 192.168.1.15 (ext.: any) 5060 - 5069 SIP
Mar 17 21:34:34 WAN 62.65.128.62:5060 192.168.1.15:5060 UDP
mike
external interface has to be the interface IP. "any" is for rather special needs and should not be used usually. I'm out of clues ::)