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O 1. 172.24.5.160 » 172.24.5.159 sip Request: REGISTER sip:172.24.5.159;transport=UDP
O 2. 172.24.5.159 » 172.24.5.160 sip Status: 100 Trying (0 bindings)
O 3. 172.24.5.159 » 172.24.5.160 sip Status: 200 OK (1 bindings)
O 4. 172.24.5.160 » 172.24.5.159 sip Request: SUBSCRIBE sip:5008@172.24.5.159;transport=UDP
O 5. 172.24.5.159 » 172.24.5.160 sip Status: 100 Trying

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