Pls could u be more elaborate as I am new to asterisk.. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Eric Wieling Sent: Wednesday, April 13, 2005 7:37 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [Asterisk-Users] VAD/DTX implementation through zaptel cards
The only time PLC makes sense is thwn you are converting FROM VoIP to something else. So PLC would be done on chan_sip or chan_IAX, or chan_h323 on the receiving end. This is for 1.0.x. For CVS-HEAD you would want to do this on the receiving side in the PLC stuff. parijat wrote: > Hi, > Thanks for helping me out. > > I want to clear out few more points > > 1) zaptel cards receive PCM from PSTN. In what form do they give it to > asterisk. Do Zaptel cards CODE/DECODE PCM from PSTN to RTP or zaptel cards > forward PCM to asterisk which converts it to RTP. > > 2) If asterisk does that conversion then, using which file > does it convert. I want to change code of that file so that I can implement > VAD. > > 3) If all this is not possible then why they have give so many codec files > in asterisk. > > Regards, > Parijat > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Steve > Underwood > Sent: Tuesday, April 12, 2005 9:40 PM > To: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: Re: [Asterisk-Users] VAD/DTX implementation through zaptel cards > > Steve Kann wrote: > > >>Eric Wieling wrote: >> >> >>>[EMAIL PROTECTED] wrote: >>> >>> >>>>Hi, >>>>How can i implement VAD/DTX using zaptel with asterisk towards PSTN. >>> >>> >>> >>>TDM (PSTN/telcos) do not support VAD. The entire idea of VAD is not >>>even a valid idea. >> >> >>Doing VAD on audio coming _from_ the TDM world certainly is something >>you might want to do, to dramatically reduce the bandwidth you consume >>when sending the audio via VoIP channels. >> >>This kind of thing is not presently implemented in *, though, but it >>could be. (note: doing it well will require a bunch of CPU, though. I >>wonder if it could be done in the same DSP that is doing >>echo-cancellation on the new TE4xxP boards? > > > Unless Digium's plans changed since the last time I spoke to Mark, the > answer would be no. I believe they are using a dedicated function echo > canceller device. -- Always do right. This will gratify some people and astonish the rest. Mark Twain _______________________________________________ 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