[asterisk-users] Why such high latency on internal lan?

[Steve Totaro]

On Sat, Oct 23, 2010 at 12:31 PM, sean darcy <seandarcy2 at gmail.com> wrote:

> 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 <teliax ip address>
> ........
> rtt min/avg/max/mdev = 3.471/4.120/4.466/0.288 ms
>
>
> sean
>
>
As long as your qualify is set high enough that the phone doesn't become
"Unavailable" then your only real worry is if RTP is also experiencing lag,
which I highly doubt since your ping times are almost nothing.

It is bothersome as an admin, but just realize that it is what it is.  Trust
the ping times for network latency and show peers for a quick
connectivity/registration check.

Thanks,
Steve T
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