To: <sip:618@192.168.0.121>
        Contact: <sip:277@192.168.253.35>
        Call-ID: 4d40e0394e6cfdb40c084d1f5654132f@192.168.253.35
        CSeq: 102 INVITE
        User-Agent: Asterisk PBX
        Max-Forwards: 70
        Date: Mon, 23 Jun 2008 13:48:04 GMT
        Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
        Content-Type: application/sdp
        Content-Length: 267

        v=0
        o=root 27793 27793 IN IP4 192.168.253.35
        s=session
        c=IN IP4 192.168.253.35
        t=0 0
        m=audio 19480 RTP/AVP 8 3 0 101
        a=rtpmap:8 PCMA/8000
        a=rtpmap:3 GSM/8000
        a=rtpmap:0 PCMU/8000
        a=rtpmap:101 telephone-event/8000
        a=fmtp:101 0-16
        a=silenceSupp:off - - - -

15:48:04.502431 IP (tos 0x68, ttl 252, id 273, offset 0, flags [none], proto: UDP (17), length: 474) 192.168.0.121.5060 > 192.168.253.35.5060: SIP, length: 446
        SIP/2.0 400 Bad Request - 'Invalid Host'
        Via: SIP/2.0/UDP 192.168.253.35:5060;branch=z9hG4bK34487a40;rport
        From: "Emmanuel Sovaridis" <sip:277@192.168.253.35>;tag=as42d93fee
        To: <sip:618@192.168.0.121>;tag=F7A85C-BA7
        Date: Mon, 23 Jun 2008 13:45:13 GMT
        Call-ID: 4d40e0394e6cfdb40c084d1f5654132f@192.168.253.35
        Server: Cisco-SIPGateway/IOS-12.x
        CSeq: 102 INVITE
        Allow-Events: telephone-event
        Reason: Q.850;cause=100
        Content-Length: 0