On Wed, May 21, 2008 at 8:11 AM, Steve Totaro <[EMAIL PROTECTED]> wrote: > On Wed, May 21, 2008 at 7:28 AM, bilal ghayyad <[EMAIL PROTECTED]> wrote: >> Dears; >> >> I do not know if any had experience in using speex or >> ilbc with IAX and got good results, because I am >> facing a problem with GSM. >> >> I am facing a noise problem when I am using GSM with >> IAX trunk as following: >> >> IP Phone (G711) ---> Local Asterisk Box ---> IAX Trunk >> using GSM codec ---> Remote Asterisk Box ---> Digium >> Card (FXO) to terminate the call to the destination >> >> While no noise happen if that senario is happening: >> >> IP Phone (G711) ---> Local Asterisk Box ---> IAX Trunk >> using GSM codec ---> Remote Asterisk Box ---> Digium >> Card (FXS) to an extension >> >> I tried to use GSM with IAX trunk, and actually I got >> a problem that: when I am using IP Phone (Polycom 320, >> with G711 codec) and placed a call, that call will go >> via the IAX trunk to the remote Asterisk Box, then >> using the Digium TDM22B card to terminate the call via >> the PSTN analoge lines, there is a noise coming with >> the voice! This noise does not appear if we do not use >> the "IAX trunk and if the call is not going to be >> terminated via the Digium Card (FXO) on the remote >> Asterisk Box (if we use IAX trunk and we call an >> extension (FXS) on a remote Asterisk but not the PSTN >> and the FXO on the remote Asterisk, then no noise >> appear). >> >> So the noise happen only in that senario: >> >> IP Phone (G711) ---> Local Asterisk Box ---> IAX Trunk >> using GSM codec ---> Remote Asterisk Box ---> Digium >> Card (FXO) to terminate the call to the destination >> >> While no noise happen if that senario is happening: >> >> IP Phone (G711) ---> Local Asterisk Box ---> IAX Trunk >> using GSM codec ---> Remote Asterisk Box ---> Digium >> Card (FXS) to an extension >> >> I do not know if it is a matter of the GSM codec, or >> if it is related to the digium card that it is the old >> model. >> >> But any one can advise if speex or ilbc will give >> better performance than GSM with IAX trunk? >> >> Any advise? >> Regards >> Bilal >> >> -------------------- >> bilal ghayyad wrote: >>> Hi List; >>> >>> Anyone tried to use speex, ilbc and g729 and come >> back >>> with a preferred one in the quality? >>> >>> Regards >>> Bilal >>> >>> >>> >> >> ____________________________________________________________________________________ >>> Never miss a thing. Make Yahoo your home page. >>> http://www.yahoo.com/r/hs >>> >>> _______________________________________________ >>> -- 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 >>> >> Depends on what you're using it for. We've had >> excellent luck with >> iLBC >> for voice quality and g729 as well. Speex is better >> than GSM, but not >> spectacularly. >> >> The problem with all of them of course, is >> transcoding. They have less >> of a bandwidth footprint for acceptable quality, but >> more of a >> processor >> footprint. >> >> N. >> > > I would check the "old" digium card first. Check interrupts and all. > Describe the "noise". > > I am inclined to to think it is a hardware issue since it only > exhibits itself when using the Digium card. > > Thanks, > Steve Totaro >
Second thought to consider, I have seen FXO modules go bad where they generate noise but do not completely die. Can you route the call to different FXO modules and see if it makes a difference? Thanks, Steve Totaro _______________________________________________ -- 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
