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=z9hG4bK09ad9a0c
        From: <sip:6096-int@10.2.7.2>;tag=0017e0134094000f67b92856-50c7d46e
        To: <sip:6096-int@10.2.7.2>
        Call-ID: 0017e013-40940008-6190c066-38823ddb@10.2.7.254
        Max-Forwards: 70
        CSeq: 103 REGISTER
        User-Agent: Cisco-CP7960G/8.0
        Contact: <sip:6096-int@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=z9hG4bK09ad9a0c;received=10.2.7.254
        From: <sip:6096-int@10.2.7.2>;tag=0017e0134094000f67b92856-50c7d46e
        To: <sip:6096-int@10.2.7.2>
        Call-ID: 0017e013-40940008-6190c066-38823ddb@10.2.7.254
        CSeq: 103 REGISTER
        User-Agent: Asterisk PBX
        Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
        Contact: <sip:6096-int@10.2.7.2>
        Content-Length: 0
        
        
        SIP/2.0 401 Unauthorized
        Via: SIP/2.0/UDP 10.2.7.254:5060;branch=z9hG4bK09ad9a0c;received=10.2.7.254
        From: <sip:6096-int@10.2.7.2>;tag=0017e0134094000f67b92856-50c7d46e
        To: <sip:6096-int@10.2.7.2>;tag=as1406d1f2
        Call-ID: 0017e013-40940008-6190c066-38823ddb@10.2.7.254
        CSeq: 103 REGISTER
        User-Agent: Asterisk PBX
        Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
        WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="3f1a46d2"
        Content-Length: 0