Barton Fisher wrote: > Thanks, OK, a bit confused.... The cards are TE410P. I really don't > see how the set a codec for this, other than it might default to > something in code like ulaw. Any clue on how to verify codec in use > during a call? > G.711ulaw and G.711alaw are the audio transmission methods used for ISDN. If you have a T1 line then the transmission method is G.711ulaw.
I've been told that if you play a ulaw signal down an alaw line (T1 signal down E1) then at the other end the voice sounds a bit like a dalek. (Iit's very hard to do this with asterisk since it automatically transcodes between endpoints). The lack of a performance hit is quite striking when you have a recording playing back as a native format rather than being transcoded. (well, it's quite striking when you have thousands of them running simultaneously). > Bart > > Steve Totaro wrote: >> Michiel van Baak wrote: >> >>> On 10:28, Sun 09 Sep 07, Barton Fisher wrote: >>> >>>> I have 4 TDM T1's going in to a IVR system. The IVR messages are >>>> recorded .wav format - The system appears to crap out at about 40 >>>> calls - Would using GSM or some other format help save CPU cycles? >>>> Using 1.2, Dual Xeon and 2GB ram >>>> >>> depends on what codec the T1 is using. >>> Best to transcode the ivr sounds to the same codec to >>> prevent on-the-fly transcoding by asterisk. >>> >>> >> The answer is going to ulaw or alaw depending where you live. T1 >> should most likely be using ulaw so make everything ulaw, end to end. >> >> Thanks, >> Steve Totaro >> >> _______________________________________________ >> >> Sign up now for AstriCon 2007! September 25-28th. >> http://www.astricon.net/ >> --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 >> >> >> >> __________ NOD32 2516 (20070909) Information __________ >> >> This message was checked by NOD32 antivirus system. >> http://www.eset.com >> >> >> >> > > _______________________________________________ > > Sign up now for AstriCon 2007! September 25-28th. http://www.astricon.net/ > > --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 _______________________________________________ Sign up now for AstriCon 2007! September 25-28th. http://www.astricon.net/ --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