thufir@doge:~$
thufir@doge:~$ sipsak -vv -s sip:[email protected]
warning: need raw socket (root privileges) to receive all ICMP errors

message received:
SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 127.0.1.1:43933;branch=z9hG4bK.5fbc7fc0;alias;received=192.168.1.3;rport=41993
From: sip:[email protected]:43933;tag=3ff9c945
To: sip:[email protected];tag=as7f56f3a5
Call-ID: [email protected]
CSeq: 1 OPTIONS
Server: Asterisk PBX 1.8.32.1-vici
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Accept: application/sdp
Content-Length: 0



** reply received after 0.778 ms **
   SIP/2.0 404 Not Found
   final received
thufir@doge:~$




and on the asterisk box:


tleilax*CLI>
tleilax*CLI> sip show user thufir101


  * Name       : thufir101
  Secret       : <Set>
  MD5Secret    : <Not set>
  Context      : default
  Language     : en
  Accountcode  : thufir101
  AMA flags    : Unknown
  Netborder CPD: No
  Transfer mode: open
  MaxCallBR    : 384 kbps
  CallingPres  : Presentation Allowed, Not Screened
  Call limit   : 0
  Callgroup    :
  Pickupgroup  :
  Callerid     : "atreides" <123>
  ACL          : No
  Sess-Timers  : Accept
  Sess-Refresh : uas
  Sess-Expires : 1800 secs
  Sess-Min-SE  : 90 secs
  RTP Engine   : asterisk
  Codec Order  : (ulaw:20,gsm:20)
  Auto-Framing:  No

tleilax*CLI>