<p>if version: kamailio 4.4.4 (x86_64/linux) 852c47</p>
<p>10.1.244.235:5060            176.99.138.244:5060<br>
──────────┬─────────          ──────────┬─────────<br>
│        INVITE (SDP)         │<br>
│ ──────────────────────────> │<br>
│      401 Unauthorized       │<br>
│ <────────────────────────── │<br>
│             ACK             │<br>
│ ──────────────────────────> │<br>
│        INVITE (SDP)         │<br>
│ ──────────────────────────> │<br>
│         100 Trying          │<br>
│ <────────────────────────── │<br>
│         180 Ringing         │<br>
│ <────────────────────────── │<br>
│           CANCEL            │<br>
│ ──────────────────────────> │<br>
│      500 Server error       │<br>
│ <────────────────────────── │</p>

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