sip.conf

[general]
allowguest=yes
bindport=5060
bindaddr=0.0.0.0
tos_sip=cs3
tos_audio=ef
tos_video=af41
checkmwi=10
vmexten=voicemail
disallow=all
allow=ulaw
allow=alaw
allow=gsm
mohinterpet=default
extenip=xxx.xxx.xxx.xxx
localnet=192.168.2.254/255.255.255.0

[7002]
type=friend
context=internal
secret=xxxx
mailbox=7002@default
port=5060
qualify=yes
host=dynamic

sip trace from phone

Sent to udp:192.168.2.254:5060 at 24/12/2001 02:00:15:170 (810 bytes):
REGISTER sip:192.168.2.254 SIP/2.0
Via: SIP/2.0/UDP 192.168.2.154:2075;branch=z9hG4bK-70or4pa3vyzr;rport
From: "7002" <sip:7002@192.168.2.254>;tag=pjj2j4v11p
To: "7002" <sip:7002@192.168.2.254>
Call-ID: 3c26700ea122-idm41mcl1mk4@snom300-000413258F9D
CSeq: 1 REGISTER
Max-Forwards: 70
Contact: <sip:7002@192.168.2.154:2075;line=0koxwjz3>;q=0.8;flow-id=1;+sip.instance="<urn:uuid:767e30a9-0c85-4238-ab02-e04eb40f3722>";audio;mobility="fixed";duplex="full";description="snom300";actor="principal";events="dialog";methods="INVITE,ACK,CANCEL,BYE,REFER,OPTIONS,NOTIFY,SUBSCRIBE,PRACK,MESSAGE,INFO"
User-Agent: snom300/6.2.3
Supported: gruu
Allow-Events: dialog
X-Real-IP: 192.168.2.154
WWW-Contact: <http://192.168.2.154:80>
WWW-Contact: <https://192.168.2.154:443>
Expires: 3600
Content-Length: 0