[Asterisk-Users] help understanding sip header

[snacktime]

What are these messages that * constantly sends to the client?  And
why does it always say 'looking for [server ip] in default'  ?

Sometimes I see 404's instead of 200's, and I know something is wrong
but I don't know what is being signalled here.

In this case 206.80.111.117 is the * server,  and 4.27.217.38 is my nat box.


<-- SIP read from 4.27.217.38:61384: 
OPTIONS sip:206.80.111.117 SIP/2.0
Content-Length: 0
Call-ID: 5F620712-81EE-4E77-925D-DCF4697C129E at 192.168.0.30
From: <sip:chris at 206.80.111.117>;tag=22240583790
CSeq: 7 OPTIONS
Max-Forwards: 70
To: <sip:206.80.111.117>
Via: SIP/2.0/UDP
192.168.0.30;rport;branch=z9hG4bKc0a8001e0131c9b1424260a4000012c800000019


--- (8 headers 0 lines)---
Looking for 206.80.111.117 in default
Transmitting (no NAT) to 4.27.217.38:61384:
SIP/2.0 200 OK
Via: SIP/2.0/UDP
192.168.0.30;branch=z9hG4bKc0a8001e0131c9b1424260a4000012c800000019
From: <sip:chris at 206.80.111.117>;tag=22240583790
To: <sip:206.80.111.117>;tag=as298650c3
Call-ID: 5F620712-81EE-4E77-925D-DCF4697C129E at 192.168.0.30
CSeq: 7 OPTIONS
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER
Contact: <sip:206.80.111.117>
Accept: application/sdp
Content-Length: 0


---
Destroying call '5F620712-81EE-4E77-925D-DCF4697C129E at 192.168.0.30'