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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>FYI,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I have a copy of Matthew Gast’s <i><span
style='font-style:italic'>T1 – A Survival Guide</span></i> and it goes over all
this stuff pretty well.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-MC<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
freeswitch-users-bounces@lists.freeswitch.org
[mailto:freeswitch-users-bounces@lists.freeswitch.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Dennis D Hock<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, August 22, 2008 8:50
AM<br>
<b><span style='font-weight:bold'>To:</span></b> Robert Dyck<br>
<b><span style='font-weight:bold'>Cc:</span></b> <st1:PersonName w:st="on">freeswitch-users@lists.freeswitch.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Freeswitch-users] T1
RBS Support Revisited</span></font><o:p></o:p></p>
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12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'>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.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'>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.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'>Take care,<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'><br>
Dennis Hock<o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 color="#990099"
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:#990099'>-----Robert
Dyck <rob.dyck@telus.net> wrote: -----</span></font><font size=2
face=Verdana><span style='font-size:10.0pt;font-family:Verdana'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Verdana><span
style='font-size:10.0pt;font-family:Verdana'>To: <st1:PersonName w:st="on">freeswitch-users@lists.freeswitch.org</st1:PersonName><br>
From: Robert Dyck <rob.dyck@telus.net><br>
Date: 08/22/2008 11:40AM<br>
cc: Dennis D Hock <hockd@dteenergy.com><br>
Subject: Re: [Freeswitch-users] T1 RBS Support Revisited<br>
<br>
</span></font><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>I messed up. The E lead receives signalling whereas
the M lead is used to send <br>
to the far end.<br>
<br>
On Friday 22 August 2008, Dennis D Hock wrote:<br>
> Rob I believe you have the grasp of RBS. It has nothing to do with
MF or<br>
> the type of signaling per se but rather the encoding of the signaling as<br>
> you have described it here.<br>
><br>
> Dennis Hock<br>
><br>
> -----freeswitch-users-bounces@lists.freeswitch.org wrote: -----<br>
><br>
><br>
> To: <st1:PersonName w:st="on">freeswitch-users@lists.freeswitch.org</st1:PersonName><br>
> From: Robert Dyck <rob.dyck@telus.net><br>
> Sent by: freeswitch-users-bounces@lists.freeswitch.org<br>
> Date: 08/21/2008 11:08PM<br>
> Subject: Re: [Freeswitch-users] T1 RBS Support Revisited<br>
><br>
> If RBS means robbed bit signalling then it is transmitted in the media bit<br>
> stream but as the name implies it is not used for media. If I remember<br>
> correctly the LSB from every sixth frame is robbed leaving 7 bits and 1<br>
> faked which would probably be correct about 50% of the time. RBS
introduces<br>
> a small amount of distortion. The channel bank will use the state of the<br>
> signalling bit to set the M lead (on or offhook ) of the appropriate<br>
> channel. The E lead sets the signalling bit for the other direction. Think<br>
> Ear and Mouth.<br>
><br>
> MF of course is encoded into the bit stream the same as any other audio<br>
> source. To avoid RBS, on/offhook can be transmitted using SF ( 2600 HZ )
in<br>
> band. You would want to disable RBS in that case. Compatible equipment is<br>
> required obviously.<br>
><br>
> On Thursday 21 August 2008, Brian West wrote:<br>
> > Isn't RBS more than just MF? Unless I'm forgetting something
you rob<br>
> > a bit.<br>
> ><br>
> > /b<br>
> ><br>
> > On Aug 21, 2008, at 7:44 PM, John Wehle wrote:<br>
> > >> Is there support in FreeSWITCH for MF?<br>
> > ><br>
> > > To answer my own question ...<br>
> > ><br>
> > > Perhaps I can add a ZAP_COMMAND_SEND_MF case to
zap_channel_command<br>
> > > patterned after ZAP_COMMAND_SEND_DTMF and just use
teletone_set_tone<br>
> > > to set the proper frequencies???<br>
> > ><br>
> > > -- John<br>
> > >
-----------------------------------------------------------------------<br>
> > >--<br>
> > ><br>
> > > | Feith Systems | Voice: 1-215-646-8000
| Email:<br>
> > ><br>
> > > john@feith.com |<br>
> > ><br>
> > > | John Wehle | Fax: 1-215-540-5495<br>
> > ><br>
> > >
-----------------------------------------------------------------------<br>
> > >--<br>
> > ><br>
> > ><br>
> > > _______________________________________________<br>
> > > Freeswitch-users mailing list<br>
> > > Freeswitch-users@lists.freeswitch.org<br>
> > > <a
href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users"
target=blank>http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
> > > UNSUBSCRIBE:<a
href="http://lists.freeswitch.org/mailman/options/freeswitch-user"
target=blank>http://lists.freeswitch.org/mailman/options/freeswitch-user</a><br>
> > >s <a href="http://www.freeswitch.org/" target=blank>http://www.freeswitch.org</a><br>
> ><br>
> > Brian West<br>
> > sip:brian@freeswitch.org<br>
> ><br>
> ><br>
> ><br>
> ><br>
> > _______________________________________________<br>
> > Freeswitch-users mailing list<br>
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> > <a href="http://www.freeswitch.org/" target=blank>http://www.freeswitch.org</a><br>
><br>
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