Default From and Contact header domain

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Hello all,

I have a server which is sending INVITEs with a From and Contact header that
contains a domain part of the address (an IP address) that I can’t explain.
My sip.conf does not set a domain.
For example in the following line the 123.456.789.012 is the part I can’t
explain.

From: “” ;tag=aa00104d30

Does anyone know where Asterisk gets the default for these headers from?

Thanks!