/usr/share/doc/sipdialer/test.html is in sipdialer 1:1.11.0~beta5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50  | <ul>
  <li><a href="tel:+442071358378">tel:+442071358378</a></li>
  <li><a href="tel:00442071358378">tel:00442071358378</a></li>
  <li><a href="sip:442071358378@lvdx.com">sip:442071358378@lvdx.com</a></li>
  <li><a href="tel:1703">tel:1703</a></li>
  <li><a href="tel:+44-20-7135-8378">tel:+44-20-7135-8378</a></li>
  <li><a href="tel:+44.20.7135.8378">tel:+44.20.7135.8378</a></li>
</ul>
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