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
> > >
> > > -----------------------------------------------------------------------
> > >--
> > >
> > >
> > > _______________________________________________
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> >
> > Brian West
> > sip:[EMAIL PROTECTED]
> >
> >
> >
> >
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