Joegen,
Thanks for the explanation J I will check my RTP stream, but I do see this in every call on my system, internally and externally….. We use the SPA504G phone from Cisco, perhaps you know its normal behavior for a cisco to wait till it receives the ACK. Greetings, Henry From: Joegen Baclor [mailto:[email protected]] Sent: donderdag 30 juni 2011 2:58 To: Discussion list for users of sipXecs software Cc: Henry Dogger Subject: Re: [sipx-users] some lag when answering phone 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: [email protected] [mailto:[email protected]] 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: [email protected] [mailto:[email protected]] 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 _______________________________________________ sipx-users mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-users/
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