I'm looking for the equivalent of the UK's NHS 111 number, for 24-hour medical assistance, in Iceland.

The NHS webpage says:

1770 – medical assistance

The US embassy disagrees with this, but then goes on to contradict themselves:

For urgent after-hours primary care, call 1700.

[...]

From 23:30 to 8:00 you should call 1770 as described above.

I don't know icelandic, but this first number seems to be backed up by a clinic website:

SÍMI VAKTÞJÓNUSTU LÆKNA OG HJÚKRUNARFRÆÐINGA Á HSU ER 1700

Meanwhile, the visit reykjavik website lists a different number again:

Health Care Services (out of hours) Tel: 1170

It's shocking how inconsistent this all is. Which one is correct?

None of these numbers are working for me.