Henry,
Delay in ACK can be of various natural causes. It could be a simply a
fluke where it coincides with the system did not give the thread
processing the ACK even a time-slice soon enough. So for us to really
delve into this and give it a bug status, you need to provide solid
evidence that this is a regular occurence or if not, what are are
conditions that might trigger it to happen occasionally.
Also, ACK for 200 Ok is an end to end thing. Therefore most user
agents will not wait for ACK to start streaming audio since ACK might be
travelling a bunch of SIP proxies and would definitely result to audio
getting snipped. User agents normally start streaming as soon as they
send out 200 OK.
The key here is not ACK but to see when audio (RTP) starts streaming
from callee to caller.
Joegen
On 06/29/2011 04:04 PM, Henry Dogger wrote:
Anyone?
*From:*sipx-users-boun...@list.sipfoundry.org
[mailto:sipx-users-boun...@list.sipfoundry.org] *On Behalf Of *Henry
Dogger
*Sent:* dinsdag 28 juni 2011 14:05
*To:* Discussion list for users of sipXecs software
*Subject:* Re: [sipx-users] some lag when answering phone
In addition to this problem I made some tcpdumps to check what sipXecs
is actually sending…
I noticed this call which I attached as a part of my dump.
I see normal behavior, until sipXecs is not responding to the ACK on
the OK message….
I takes half a second for sipXecs to put this ACK through to the phone…
Any idea why sipXecs is causing this delay?
Greetings,
Henry
*From:*sipx-users-boun...@list.sipfoundry.org
[mailto:sipx-users-boun...@list.sipfoundry.org] *On Behalf Of *Henry
Dogger
*Sent:* woensdag 15 juni 2011 15:25
*To:* Discussion list for users of sipXecs software
*Subject:* [sipx-users] some lag when answering phone
Hi all,
I noticed some lag on our production system, when picking up the phone.
When I answer the phone it takes a second before the other side can
hear me…
I tried to reproduce on our test environment but there was only a
slight lag (0.2s) from the phone.
I made traces on both systems, and I noticed a difference… On my
production system the ACK after the OK is held by the proxy for half a
second, apparently the phone does not get this, and the proxy sends
another one half a second behind the first attempt. I do not see this
behavior on our test system.
I attached the traces, does anyone know what could cause this?
Using sipXecs-4.2.1 both systems are setup identically.
Kind regards,
Henry Dogger
Telecats BV
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