[Freeswitch-users] T1 RBS Support Revisited

[Michael Collins]

FYI,

 

I have a copy of Matthew Gast's T1 - A Survival Guide and it goes over
all this stuff pretty well.

-MC

 

________________________________

From: freeswitch-users-bounces at lists.freeswitch.org
[mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of
Dennis D Hock
Sent: Friday, August 22, 2008 8:50 AM
To: Robert Dyck
Cc: freeswitch-users at 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 <rob.dyck at telus.net> wrote: -----

To: freeswitch-users at lists.freeswitch.org
From: Robert Dyck <rob.dyck at telus.net>
Date: 08/22/2008 11:40AM
cc: Dennis D Hock <hockd at dteenergy.com>
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
>
> -----freeswitch-users-bounces at lists.freeswitch.org wrote: -----
>
>
> To: freeswitch-users at lists.freeswitch.org
> From: Robert Dyck <rob.dyck at telus.net>
> Sent by: freeswitch-users-bounces at lists.freeswitch.org
> 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:
> > >
> > > john at feith.com  |
> > >
> > > |    John Wehle    |     Fax: 1-215-540-5495
> > >
> > >
-----------------------------------------------------------------------
> > >--
> > >
> > >
> > > _______________________________________________
> > > Freeswitch-users mailing list
> > > Freeswitch-users at 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:brian at freeswitch.org
> >
> >
> >
> >
> > _______________________________________________
> > Freeswitch-users mailing list
> > Freeswitch-users at 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 at 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/> 



 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20080822/9c9e32cf/attachment.html