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

[Brad .]

It depends on the type of sip end point, and how long it takes to respond to a SIP event.

For example if I connect a Cisco 7960 IP phone to my Asterisk server over the LAN, I always see registration times of over 100ms. 

But if I connect X-Lite I get registration times of under 10ms.

Asterisk connected as a SIP client, under 2ms.

The higher latency with the Cisco's don't seem to effect performance at all.

--

Brad



> To: asterisk-users at lists.digium.com
> From: seandarcy2 at gmail.com
> Date: Sat, 23 Oct 2010 12:31:58 -0400
> Subject: [asterisk-users] Why such high latency on internal lan?
> 
> 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
> 
> 
> 
> 
> 
> 
> 
> -- 
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