<FONT face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" size=2><DIV>Rob I believe you have the grasp of RBS.&nbsp; 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.</DIV><DIV>&nbsp;</DIV><DIV>Dennis Hock<BR></DIV><FONT color=#990099>-----freeswitch-users-bounces@lists.freeswitch.org wrote: -----<BR><BR></FONT><BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">To: freeswitch-users@lists.freeswitch.org<BR>From: Robert Dyck &lt;rob.dyck@telus.net&gt;<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><FONT face="Default Monospace,Courier New,Courier,monospace" size=2>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 faked <BR>which would probably be correct about 50% of the time. RBS introduces a small <BR>amount of distortion. The channel bank will use the state of the signalling <BR>bit to set the M lead (on or offhook ) of the appropriate channel. The E lead <BR>sets the signalling bit for the other direction. Think 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>&gt; Isn't RBS more than just MF? &nbsp;Unless I'm forgetting something you rob<BR>&gt; a bit.<BR>&gt;<BR>&gt; /b<BR>&gt;<BR>&gt; On Aug 21, 2008, at 7:44 PM, John Wehle wrote:<BR>&gt; &gt;&gt; Is there support in FreeSWITCH for MF?<BR>&gt; &gt;<BR>&gt; &gt; To answer my own question ...<BR>&gt; &gt;<BR>&gt; &gt; Perhaps I can add a ZAP_COMMAND_SEND_MF case to zap_channel_command<BR>&gt; &gt; patterned after ZAP_COMMAND_SEND_DTMF and just use teletone_set_tone<BR>&gt; &gt; to set the proper frequencies???<BR>&gt; &gt;<BR>&gt; &gt; -- John<BR>&gt; &gt; -------------------------------------------------------------------------<BR>&gt; &gt;<BR>&gt; &gt; | &nbsp; Feith Systems &nbsp;| &nbsp; Voice: 1-215-646-8000 &nbsp;| &nbsp;Email:<BR>&gt; &gt;<BR>&gt; &gt; john@feith.com &nbsp;|<BR>&gt; &gt;<BR>&gt; &gt; | &nbsp; &nbsp;John Wehle &nbsp; &nbsp;| &nbsp; &nbsp; Fax: 1-215-540-5495<BR>&gt; &gt;<BR>&gt; &gt; -------------------------------------------------------------------------<BR>&gt; &gt;<BR>&gt; &gt;<BR>&gt; &gt; _______________________________________________<BR>&gt; &gt; Freeswitch-users mailing list<BR>&gt; &gt; Freeswitch-users@lists.freeswitch.org<BR>&gt; &gt; <A href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target=blank>http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</A><BR>&gt; &gt; UNSUBSCRIBE:<A href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target=blank>http://lists.freeswitch.org/mailman/options/freeswitch-users</A><BR>&gt; &gt; <A href="http://www.freeswitch.org/" target=blank>http://www.freeswitch.org</A><BR>&gt;<BR>&gt; Brian West<BR>&gt; sip:brian@freeswitch.org<BR>&gt;<BR>&gt;<BR>&gt;<BR>&gt;<BR>&gt; _______________________________________________<BR>&gt; Freeswitch-users mailing list<BR>&gt; Freeswitch-users@lists.freeswitch.org<BR>&gt; <A href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target=blank>http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</A><BR>&gt; UNSUBSCRIBE:<A href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target=blank>http://lists.freeswitch.org/mailman/options/freeswitch-users</A><BR>&gt; <A href="http://www.freeswitch.org/" target=blank>http://www.freeswitch.org</A><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-users" target=blank>http://lists.freeswitch.org/mailman/options/freeswitch-users</A><BR><A href="http://www.freeswitch.org/" target=blank>http://www.freeswitch.org</A><BR></FONT></BLOCKQUOTE><BR></FONT>