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Wrong Contact info?

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I wonder how to go from:

Via: SIP/2.0/UDP InternalIP:5060;branch=abc;rport
From: "0123456" <sip:0123456@isp.lan>;tag=123

Contact: <sip:0123456@InternalIP:5060;transport=udp>

to something like this? :huh:

Via: SIP/2.0/UDP ExtIP:5060;branch=abc;rport
From: "0123456" <sip:0123456@isp.lan>;tag=123

Contact: <sip:0123456@isp.lan:5060;transport=udp>

User-Agent: MyCustomCPEname

o=- x x IN IP4 ExtIP

c=IN IP4 ExtIP

I'm afraid it is not possible without NAT, but at least ExtIP is static.


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