Change SIP Contact in SIP REGISTER of a Trunk SIP on Panasonic PBX NS500

[PippoFanciu]

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: 1c464e0e-bcf2022f6bb41e75c29e4c364e2d3082@192.168.3.70
From: <sip:users1@tests.it:55068>;tag=1366642418
To: <sip:users1@tests.it:55068>
CSeq: 1 REGISTER
Allow: INVITE,ACK,CANCEL,BYE,PRACK,INFO,UPDATE,OPTIONS,REGISTER,NOTIFY
User-Agent: Panasonic-MPR15-V009.00013/VSIPGW-V3.0000
Contact: *
Expires: 0
Content-Length: 0

I'd like to modify the current "Contact: *" with "Contact: <sip:users1@192.168.3.70:35060>".

Do you have any idea where I can find the menu with this setting in the GUI?
Thank you

 

[strongm]

This forum is nothing to do with telephony