REGISTER 12 headers, 0 lines
Reliably Transmitting (no NAT) to 212.144.96.86:5060:
REGISTER sip:0341.sip.arcor.de SIP/2.0
Via: SIP/2.0/UDP 192.168.100.2:5060;branch=z9hG4bK33f68aff;rport
From: <sip:03412408715@0341.sip.arcor.de>;tag=as7d8359e3
To: <sip:03412408715@0341.sip.arcor.de>
Call-ID: 0111b8590973df4556876307266d1171@127.0.1.1
CSeq: 102 REGISTER
User-Agent: Asterisk PBX
Max-Forwards: 70
Expires: 120
Contact: <sip:03412408715@192.168.100.2>
Event: registration
Content-Length: 0


---

<--- SIP read from 212.144.96.86:5060 --->
SIP/2.0 400 Missing CSeq Header
Via: SIP/2.0/UDP 192.168.100.2:5060;received=88.74.158.67;branch=z9hG4bK33f68aff;rport=22977
From: <sip:03412408715@0341.sip.arcor.de>;tag=as7d8359e3
To: <sip:03412408715@0341.sip.arcor.de>;tag=aprqngfrt-87i0l30000000
Call-ID: 0111b8590973df4556876307266d1171@192.168.100.2eq: 102 REGISTER
CSeq: 0 REGISTER


<------------->
--- (6 headers 0 lines) ---
Reliably Transmitting (NAT) to 212.144.96.86:5060:
OPTIONS sip:0341.sip.arcor.de SIP/2.0
Via: SIP/2.0/UDP 192.168.100.2:5060;branch=z9hG4bK1b7ceec0;rport
From: "asterisk" <sip:asterisk@192.168.100.2>;tag=as5148db7a
To: <sip:0341.sip.arcor.de>
Contact: <sip:asterisk@192.168.100.2>
Call-ID: 5776296c318948594883ad28748b65e3@192.168.100.2
CSeq: 102 OPTIONS
User-Agent: Asterisk PBX
Max-Forwards: 70
Date: Thu, 08 Nov 2007 10:48:33 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Content-Length: 0