FYI,
I have a copy of Matthew Gast's T1 - A Survival Guide and it goes over all this stuff pretty well. -MC ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dennis D Hock Sent: Friday, August 22, 2008 8:50 AM To: Robert Dyck Cc: freeswitch-users@lists.freeswitch.org Subject: Re: [Freeswitch-users] T1 RBS Support Revisited I reread your post and you are correct. been a long time for me working with E&M guess I am getting old as I didn't recognize what you had said until I reread it. Easy enough to Google it or if a person has access to almost any copy of the "Notes on the Networks". A good description is included in any version of that documenrt as well as other places. Take care, Dennis Hock -----Robert Dyck <[EMAIL PROTECTED]> wrote: ----- To: freeswitch-users@lists.freeswitch.org From: Robert Dyck <[EMAIL PROTECTED]> Date: 08/22/2008 11:40AM cc: Dennis D Hock <[EMAIL PROTECTED]> Subject: Re: [Freeswitch-users] T1 RBS Support Revisited I messed up. The E lead receives signalling whereas the M lead is used to send to the far end. On Friday 22 August 2008, Dennis D Hock wrote: > Rob I believe you have the grasp of RBS. It has nothing to do with MF or > the type of signaling per se but rather the encoding of the signaling as > you have described it here. > > Dennis Hock > > [EMAIL PROTECTED] wrote: ----- > > > To: freeswitch-users@lists.freeswitch.org > From: Robert Dyck <[EMAIL PROTECTED]> > Sent by: [EMAIL PROTECTED] > Date: 08/21/2008 11:08PM > Subject: Re: [Freeswitch-users] T1 RBS Support Revisited > > If RBS means robbed bit signalling then it is transmitted in the media bit > stream but as the name implies it is not used for media. If I remember > correctly the LSB from every sixth frame is robbed leaving 7 bits and 1 > faked which would probably be correct about 50% of the time. RBS introduces > a small amount of distortion. The channel bank will use the state of the > signalling bit to set the M lead (on or offhook ) of the appropriate > channel. The E lead sets the signalling bit for the other direction. Think > Ear and Mouth. > > MF of course is encoded into the bit stream the same as any other audio > source. To avoid RBS, on/offhook can be transmitted using SF ( 2600 HZ ) in > band. You would want to disable RBS in that case. Compatible equipment is > required obviously. > > On Thursday 21 August 2008, Brian West wrote: > > Isn't RBS more than just MF? Unless I'm forgetting something you rob > > a bit. > > > > /b > > > > On Aug 21, 2008, at 7:44 PM, John Wehle wrote: > > >> Is there support in FreeSWITCH for MF? > > > > > > To answer my own question ... > > > > > > Perhaps I can add a ZAP_COMMAND_SEND_MF case to zap_channel_command > > > patterned after ZAP_COMMAND_SEND_DTMF and just use teletone_set_tone > > > to set the proper frequencies??? > > > > > > -- John > > > ----------------------------------------------------------------------- > > >-- > > > > > > | Feith Systems | Voice: 1-215-646-8000 | Email: > > > > > > [EMAIL PROTECTED] | > > > > > > | John Wehle | Fax: 1-215-540-5495 > > > > > > ----------------------------------------------------------------------- > > >-- > > > > > > > > > _______________________________________________ > > > Freeswitch-users mailing list > > > Freeswitch-users@lists.freeswitch.org > > > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users > > > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-user > > >s http://www.freeswitch.org <http://www.freeswitch.org/> > > > > Brian West > > sip:[EMAIL PROTECTED] > > > > > > > > > > _______________________________________________ > > Freeswitch-users mailing list > > Freeswitch-users@lists.freeswitch.org > > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users > > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users > > http://www.freeswitch.org <http://www.freeswitch.org/> > > _______________________________________________ > Freeswitch-users mailing list > Freeswitch-users@lists.freeswitch.org > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users > http://www.freeswitch.org <http://www.freeswitch.org/>
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