Hello, thanks for your help.
I attach the whole INVITE message
INVITE sip:+393922568003@ims.example.net;user=phone SIP/2.0
Via: SIP/2.0/TCP
10.139.140.249:5260;branch=z9hG4bK+183a8f199afae25013ec3da9c768d7e71+sip+1+a64ef5ee
From: "Flavio"
<sip:+393891524510@ims.example.net>;tag=10.139.140.249+1+6a272b5b+75130025
To: <sip:+393922568003@ims.example.net>
CSeq: 1 INVITE
Expires: 180
Route: <sip:orig@scscf.ims.example.net:7060;lr>
Content-Length: 250
Call-Info:
<sip:10.139.140.249:5260>;method="NOTIFY;Event=telephone-event;Duration=2000"
Supported: replaces
P-Charging-Vector: icid-value=070d4ad6d2ad162b8aa5bb701dbca1f5
Contact: <sip:+393891524510@10.139.246.113:32734>
Record-Route: <sip:10.139.140.249:5260;transport=tcp;lr>
Content-Type: application/sdp
P-Served-User: sip:+393891524510@ims.example.net
P-Asserted-Identity: sip:+393891524510@ims.example.net
Max-Forwards: 69
Call-ID:
0gQAAC8WAAACBAAALxYAAHDXeTpfsrd8TbexIcx32VhAZNOydD+L9Uama1JAimxtSDPFHcDNu7JpFnHKPNLfKQ--(a)10.139.140.249
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE,
SUBSCRIBE, INFO
User-Agent: X-Lite release 4.5.5 stamp 71236
P-Visited-Network-ID:
sbc1.stage.ims.example.net
Accept: application/sdp, application/dtmf-relay
--
Flavio Battimo
flavio.battimo(a)gmail.com
fbattimo(a)meetecho.com
skype: flaviobattimo