I ran the test again, this time with the server software installed. The results look good.

Upstream jitter 0.0 ms
Downstream jitter 0.2 ms
Upstream packet loss 0.0 %
Downstream packet loss 0.0 %
Upstream packet order 100.0 %
Downstream packet order 100.0 %
Packet discards 0.0 %
MOS 4.1
REGISTER ms 16 ms
INVITE ms 25 ms
BYE ms 15 ms
Test Voice-over-IP