Why high latency on internal lan?

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I have a 100MB internal lan. aastra’s are wired. asterisk box is wired
next to the switch. But look:

sip show peers
……..
142/142 10.10.10.42 D A 5060 OK (137 ms)
144/144 10.10.10.44 D A 5060 OK (136 ms)
145/145 10.10.10.45 D A 5060 OK (168 ms)
150/150 10.10.10.50 D A 5060 OK (136 ms)
152/152 10.10.10.52 D A 5060 OK (133 ms)
153/153 10.10.10.53 D A 5060 OK (135 ms)

ping from the asterisk box to any of the internal phones is < 1ms. My traceroute [v0.75]
PBX
Thu Oct 21 13:58:36 2010

Host 10.10.10.42
Loss% Snt Last Avg Best Wrst StDev
0.0% 65 0.6 0.6 0.5 1.3 0.2

And latencies to outside sip providers are low:
jnctn/… 66.227.100.20 5060 OK (7 ms)
teliax/.. 8.14.120.23 N 5060 OK (7 ms)

What gives? Isn’t sip show peers measuring latency? Why so different
from ping? And, more importantly, do I have a problem?

sean