Hi, my name is Pedro Caria I'm new to this list.
I live in Portugal and find myself in the position to talk often to various parts of the world, very often the Telco line has a delay superior to 1s, I also fax in the same conditions, so to my experience faxes do work with delays far superior to 75ms.
Am I missing something ?
Pedro Caria
On 27/fev/2005, at 17:10, Lee Howard wrote:
On 2005.02.27 08:34 Martijn van Oosterhout wrote:
Hi, I read it and found it very enlightening. I do have one question regarding "Modems don't like relativity". It says modems need a constant delay; is there a limit to what it can handle. For example, would it be possible to configure a jitterbuffer right at the endpoint before the fax to put a constant delay of 1 second relative to the sender. This should be enough time to weed out any jitter. Basically, fix the jitterbuffer so the delay is constant. If a fax can handle a constant delay of up to a second you're home.
Fax cannot handle a one-second delay. As Steve mentions in the article, per-spec fax has some timings (particularly silence in direction "switching") set at 75 ms +/- 20 ms. So if the delay gets much larger than 75 ms, then there's likely to be trouble. Now, some fax machines may tolerate larger delays, but that tolerance is beyond the spec, and thus should not be used as a gauge.
Lee. _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
_______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
