Negative Lag?

Codeman007 · September 25, 2006, 9:21am

Hi,

I have searched the forum for negative lags, but I found nothing.

Perhaps I have detected a bug? I have a Siptronic ST-150 with IAX2 firmware connected to my asterisk:
Asterisk 1.2.10 built by mark @ dell.purcell.id.au on a i686 running Linux on 2006-07-27 07:20:53 UTC

My asterisk is an actualk debian version. For this phone I get negative lags when I use qualify on the link:

Sep 25 10:11:02 NOTICE[5774]: chan_iax2.c:7213 socket_read: Peer 'iax' is now TOO LAGGED (-11 ms)! Sep 25 10:11:12 NOTICE[5774]: chan_iax2.c:7207 socket_read: Peer 'iax' is now REACHABLE! Time: 17 Sep 25 10:14:13 NOTICE[5774]: chan_iax2.c:7213 socket_read: Peer 'iax' is now TOO LAGGED (-1 ms)! Sep 25 10:14:23 NOTICE[5774]: chan_iax2.c:7207 socket_read: Peer 'iax' is now REACHABLE! Time: 5 Sep 25 10:40:23 NOTICE[5774]: chan_iax2.c:7213 socket_read: Peer 'iax' is now TOO LAGGED (-1 ms)! Sep 25 10:40:33 NOTICE[5774]: chan_iax2.c:7207 socket_read: Peer 'iax' is now REACHABLE! Time: 8 Sep 25 10:44:33 NOTICE[5774]: chan_iax2.c:7213 socket_read: Peer 'iax' is now TOO LAGGED (-1 ms)! Sep 25 10:44:43 NOTICE[5774]: chan_iax2.c:7207 socket_read: Peer 'iax' is now REACHABLE! Time: 8

Is this a abug in asterisk or in the firmware of the phone? Both use NTP from the same NTP server…

Does anyone know why this happens?

Regards, Holger

ianplain · September 25, 2006, 12:10pm

Hi

What have you set the qualify time to.

This is telling you that the link is toooo slow for some reason.

Ian

Codeman007 · September 25, 2006, 12:19pm

[quote=“ianplain”]Hi

What have you set the qualify time to.

This is telling you that the link is toooo slow for some reason.

Ian[/quote]

In the definition of the phone I have only

For SIP Phones this works fine. I have replaced this with

for testing purposes.

Codeman007 · September 25, 2006, 1:09pm

No, setting qualify to a value (and not “yes”) make the same problems:

Sep 25 14:39:13 NOTICE[5774]: chan_iax2.c:7213 socket_read: Peer 'iax' is now TOO LAGGED (-6 ms)! Sep 25 14:39:23 NOTICE[5774]: chan_iax2.c:7207 socket_read: Peer 'iax' is now REACHABLE! Time: 22 Sep 25 14:43:23 NOTICE[5774]: chan_iax2.c:7213 socket_read: Peer 'iax' is now TOO LAGGED (-7 ms)! Sep 25 14:43:33 NOTICE[5774]: chan_iax2.c:7207 socket_read: Peer 'iax' is now REACHABLE! Time: 22 Sep 25 14:47:33 NOTICE[5774]: chan_iax2.c:7213 socket_read: Peer 'iax' is now TOO LAGGED (-7 ms)! Sep 25 14:47:43 NOTICE[5774]: chan_iax2.c:7207 socket_read: Peer 'iax' is now REACHABLE! Time: 22

The phone works, so I think the asterisk qualify code should be fixed so that all negative RTTs are 0. Asterisk and the phone are on a GigE backbone so it may be that the IAX qualify code is broken or cannot handle fast RTTs.

Regards, Holger