Hi Kevin, Kevin P. Fleming schrieb: > Tobias Wolf wrote: > >> If it is not possible, why is that so ? Is there really no need to do this >> and i >> am totally mistaken? > > This is generally true. Any standards-compliant FAX machine or modem > will generate a CED tone during the beginning of the call process, and > any standards compliant echo canceler (including the ones in > Zaptel/DAHDI) will respond to this tone by disabling the echo canceler. > With Zaptel/DAHDI and a software echo canceler, you can see the evidence > of this by watching the kernel message log for messages of the form > 'Disabled echo canceler because of tone (..) on channel...".
Does this only take place if fax detection is enabled in DAHDI or is it something that happens everytime a CED tone is send over the line? Since i have only deticated fax lines, i like to get rid of the fax detection for that i need to add an Wait(4) to the dialplan, after Answer(). Unfortunatly my Linux Machine seems not to log messages from DAHDI. I have looked into /var/log/kern.log There are messages from the kernel module like; Feb 11 17:38:12 officepbx kernel: wcte1xxp: Setting yellow alarm Feb 11 17:38:21 officepbx kernel: wcte1xxp: Clearing yellow alarm But no messages about echo can. Maybe i am missing configuration for the kernel module to enable logging ? > > >> Generally receiving faxes works fine, but sometimes they break and i assume >> i >> might have something to do with echo can. > > Unfortunately that is not likely to be the cause of your problems. > Well, this may be the case ... But thanks anyway for your helpful informations, they help me a lot to get a better understanding. Cheers, -- Tobias Wolf _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
