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Re: [Linphone-users] Huge delay between 100 Trying and 180 Ringing

From: s . maertens
Subject: Re: [Linphone-users] Huge delay between 100 Trying and 180 Ringing
Date: Tue, 18 Jan 2011 10:29:25 +0100 (CET)


I have found the reason for the delay.
It seems in between those two packets the hardware device is doing some DNS Query. There were two DNS servers available for the network but the first one didn't answer his DNS query. So after that request timed out, the second DNS server was used, gave the answer and the packet was sent out.

I don't know if this is due to altered code of the manufacturer or standard linphone source.

Thank you for your answer Jehan.

Best regards


----- Originele e-mail -----
Van: "Jehan Monnier" <address@hidden>
Aan: address@hidden
Verzonden: Dinsdag 18 januari 2011 09:49:36 GMT +01:00 Amsterdam / Berlijn / Bern / Rome / Stockholm / Wenen
Onderwerp: Re: [Linphone-users] Huge delay between 100 Trying and 180 Ringing

Hi Stefaan,

Well I don't see any reason for Linphone to wait 6s between the 101 and the 180. Your hardware device manufacturer has probably modified Linphone somewhere. 
To double check you may ask  for Linphone source code , and see what's going wrong.


Le 17 janv. 2011 à 16:44, address@hidden a écrit :


I have several hardware devices, using linphone embedded, connecting to our Sip Server. They are connecting over internet.
On one of the connections I notice a huge delay between the "trying" "dialog establishment"packets and the "ringing" packet.

Any hints on how I can find out where the trouble might be? As the hardware devices have only a webinterface where I can change some settings, I cannot really go into debugging on the device itself.

I have attached a screenshot of the callflow I have traced on the sipserver itself.

Any clues are highly appreciated.

Best regards

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