REGISTER sip:10.2.7.2 SIP/2.0
        Via: SIP/2.0/UDP 10.2.7.254:5060;branch=z9hG4bK1029a1dd
        From: <sip:6096@10.2.7.2>;tag=0017e0134094000d045a4ac2-6d217bab
        To: <sip:6096@10.2.7.2>
        Call-ID: 0017e013-40940006-1e1b45e9-2aa6b3d9@10.2.7.254
        Max-Forwards: 70
        CSeq: 104 REGISTER
        User-Agent: Cisco-CP7960G/8.0
        Contact: <sip:6096@10.2.7.254:5060;user=phone;transport=udp>;+sip.instance="<urn:uuid:00000000-0000-0000-0000-0017e0134094>";+u.sip!model.ccm.cisco.com="7"
        Content-Length: 0
        Expires: 120
        
        
        SIP/2.0 100 Trying
        Via: SIP/2.0/UDP 10.2.7.254:5060;branch=z9hG4bK1029a1dd;received=10.2.7.254
        From: <sip:6096@10.2.7.2>;tag=0017e0134094000d045a4ac2-6d217bab
        To: <sip:6096@10.2.7.2>
        Call-ID: 0017e013-40940006-1e1b45e9-2aa6b3d9@10.2.7.254
        CSeq: 104 REGISTER
        User-Agent: Asterisk PBX
        Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
        Contact: <sip:6096@10.2.7.2>
        Content-Length: 0
        
        
        SIP/2.0 401 Unauthorized
        Via: SIP/2.0/UDP 10.2.7.254:5060;branch=z9hG4bK1029a1dd;received=10.2.7.254
        From: <sip:6096@10.2.7.2>;tag=0017e0134094000d045a4ac2-6d217bab
        To: <sip:6096@10.2.7.2>;tag=as010f0581
        Call-ID: 0017e013-40940006-1e1b45e9-2aa6b3d9@10.2.7.254
        CSeq: 104 REGISTER
        User-Agent: Asterisk PBX
        Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
        WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="3f28f962"
        Content-Length: 0

        REGISTER sip:10.2.7.2 SIP/2.0
        Via: SIP/2.0/UDP 10.2.7.254:5060;branch=z9hG4bK2596e8d7
        From: <sip:6096@10.2.7.2>;tag=0017e0134094000e1fcda391-7d3d3796
        To: <sip:6096@10.2.7.2>
        Call-ID: 0017e013-40940007-0a17f56d-574dda32@10.2.7.254
        Max-Forwards: 70
        CSeq: 104 REGISTER
        User-Agent: Cisco-CP7960G/8.0
        Contact: <sip:6096@10.2.7.254:5060;user=phone;transport=udp>;+sip.instance="<urn:uuid:00000000-0000-0000-0000-0017e0134094>";+u.sip!model.ccm.cisco.com="7"
        Content-Length: 0
        Expires: 120
        
        
        SIP/2.0 100 Trying
        Via: SIP/2.0/UDP 10.2.7.254:5060;branch=z9hG4bK2596e8d7;received=10.2.7.254
        From: <sip:6096@10.2.7.2>;tag=0017e0134094000e1fcda391-7d3d3796
        To: <sip:6096@10.2.7.2>
        Call-ID: 0017e013-40940007-0a17f56d-574dda32@10.2.7.254
        CSeq: 104 REGISTER
        User-Agent: Asterisk PBX
        Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
        Contact: <sip:6096@10.2.7.2>
        Content-Length: 0
        
        
        SIP/2.0 401 Unauthorized
        Via: SIP/2.0/UDP 10.2.7.254:5060;branch=z9hG4bK2596e8d7;received=10.2.7.254
        From: <sip:6096@10.2.7.2>;tag=0017e0134094000e1fcda391-7d3d3796
        To: <sip:6096@10.2.7.2>;tag=as0a5554ff
        Call-ID: 0017e013-40940007-0a17f56d-574dda32@10.2.7.254
        CSeq: 104 REGISTER
        User-Agent: Asterisk PBX
        Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
        WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="5f5d830d"
        Content-Length: 0

        REGISTER sip:10.2.7.2 SIP/2.0
        Via: SIP/2.0/UDP 10.2.7.254:5060;branch=z9hG4bK5153628e
        From: <sip:6096@10.2.7.2>;tag=0017e0134094000d045a4ac2-6d217bab
        To: <sip:6096@10.2.7.2>
        Call-ID: 0017e013-40940006-1e1b45e9-2aa6b3d9@10.2.7.254
        Max-Forwards: 70
        CSeq: 105 REGISTER
        User-Agent: Cisco-CP7960G/8.0
        Contact: <sip:6096@10.2.7.254:5060;user=phone;transport=udp>;+sip.instance="<urn:uuid:00000000-0000-0000-0000-0017e0134094>";+u.sip!model.ccm.cisco.com="7"
        Authorization: Digest username="6096",realm="asterisk",uri="sip:10.2.7.2",response="6bec57e7aaedd046469fab89b39c024a",nonce="3f28f962",algorithm=MD5
        Content-Length: 0
        Expires: 120
        
        
        SIP/2.0 100 Trying
        Via: SIP/2.0/UDP 10.2.7.254:5060;branch=z9hG4bK5153628e;received=10.2.7.254
        From: <sip:6096@10.2.7.2>;tag=0017e0134094000d045a4ac2-6d217bab
        To: <sip:6096@10.2.7.2>
        Call-ID: 0017e013-40940006-1e1b45e9-2aa6b3d9@10.2.7.254
        CSeq: 105 REGISTER
        User-Agent: Asterisk PBX
        Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
        Contact: <sip:6096@10.2.7.2>
        Content-Length: 0
        
        
        SIP/2.0 200 OK
        Via: SIP/2.0/UDP 10.2.7.254:5060;branch=z9hG4bK5153628e;received=10.2.7.254
        From: <sip:6096@10.2.7.2>;tag=0017e0134094000d045a4ac2-6d217bab
        To: <sip:6096@10.2.7.2>;tag=as010f0581
        Call-ID: 0017e013-40940006-1e1b45e9-2aa6b3d9@10.2.7.254
        CSeq: 105 REGISTER
        User-Agent: Asterisk PBX
        Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
        Expires: 120
        Contact: <sip:6096@10.2.7.254:5060;user=phone;transport=udp>;expires=120
        Date: Wed, 18 Apr 2007 16:30:23 GMT
        Content-Length: 0
        
        
        NOTIFY sip:6096@10.2.7.254:5060;user=phone;transport=udp SIP/2.0
        Via: SIP/2.0/UDP 10.2.7.2:5060;branch=z9hG4bK0bca6ca8;rport
        From: "asterisk" <sip:asterisk@10.2.7.2>;tag=as6e8de8c0
        To: <sip:6096@10.2.7.254:5060;user=phone;transport=udp>
        Contact: <sip:asterisk@10.2.7.2>
        Call-ID: 77653628370961324269f47a09464e3c@10.2.7.2
        CSeq: 102 NOTIFY
        User-Agent: Asterisk PBX
        Max-Forwards: 70
        Event: message-summary
        Content-Type: application/simple-message-summary
        Content-Length: 88
        
        Messages-Waiting: no
        Message-Account: sip:asterisk@10.2.7.2
        Voice-Message: 0/0 (0/0)