Why such high latency on internal lan?

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My internal lan is small, 100mb, all wired. aastra phones.

sip show peers
…….
142/… 10.10.10.42 D A 5060 OK (136 ms)
144/… 10.10.10.44 D A 5060 OK (138 ms)
145/… 10.10.10.45 D A 5060 OK (133 ms)

But pings are < 1ms: ping 10.10.10.42
……..
rtt min/avg/max/mdev = 0.479/0.483/0.497/0.021 ms

Why are the sip latencies so high? And is it a problem? And if so, how
do I fix it?

FWIW, latencies to outside providers over nat are close to ping:

jnctn/…. 5060 OK (7 ms)
teliax/… N 5060 OK (7 ms)

ping
……..
rtt min/avg/max/mdev = 3.471/4.120/4.466/0.288 ms

sean