[Freeswitch-users] T1 RBS Support Revisited

[Michael S Collins]

BTW,

I happen to have both a line side and a trunk side T1 card for my NEC  
2400 PBX. I've done this sort of thing with asterisk and it worked  
pretty well. Please let me know when you are ready for someone to do  
some testing.

-MC

Sent from my iPhone

On Aug 21, 2008, at 8:08 PM, Robert Dyck <rob.dyck at telus.net> wrote:

> 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-users
>>> 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
>
>
>
> _______________________________________________
> 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