I'm trying to setup a SIP trunk on a Panasonic NS500 - MPR15 - ver. 009.00013, but I can't find a way to change Contact field in the SIP REGISTER.
I have this:
REGISTER sip:test.it:55069 SIP/2.0
Via: SIP/2.0/UDP 192.168.3.70:35060;branch=z9hG4bKs5a7e0049f;rport
Max-Forwards: 70
Call-ID...
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