[asterisk-users] FAX over T1 Question

[Eric "ManxPower" Wieling]

On a PRI calls come in on ANY B-channel.  Therefore you cannot just 
disable EC on the Fax channels, because there are no dedicated channels 
for fax.  On a Channelized T-1 you can dedicate channels for fax or any 
other thing.  You can't do that on PRI.

Steve Totaro wrote:
> I don't know what Eric is talking about.  My advice applies to T1 PRI
> as does the rest as far as I care to read.
> 
> Thanks,
> Steve Totaro
> 
> On Mon, Sep 8, 2008 at 10:56 AM, Amaru Netapshaak
> <postfix_amaru at yahoo.com> wrote:
>> Eric,
>>
>> So what is practical for a PRI then?
>>
>> Thank you!!!
>>
>> ++Amaru
>>
>> --- On Fri, 9/5/08, Eric "ManxPower" Wieling <eric at fnords.org> wrote:
>>
>> From: Eric "ManxPower" Wieling <eric at fnords.org>
>> Subject: Re: [asterisk-users] FAX over T1 Question
>> To: postfix_amaru at yahoo.com, "Asterisk Users Mailing List - Non-Commercial
>> Discussion" <asterisk-users at lists.digium.com>
>> Date: Friday, September 5, 2008, 10:04 PM
>>
>> The thing is, you are doing FAX over PRI, not FAX over T-1 (which to me
>> implies Channelized T-1). Seems like most people gave you advice that
>> might apply to a Channelized T-1, but would not apply or be practical
>> for a PRI.
>>
>> Amaru Netapshaak wrote:
>>> Bob,
>>>
>>> I should have added that I have disabled hardware EC on the T1 ports.
>>>
>>> Here is a sample of my zapata.conf -- channels 1-23 are my incoming PRI.
>>> This PRI handles both Voice AND FAX calls.  Having the hardware EC
>>> disabled makes for poor voice communications, and im looking for a way to
>>> enable/disable EC per the call type.   I understand that
>> "echoncancelwhenbridged"
>>> and Zapata should be telling my A104d to enable/disable HWEC
>> automatically.
>>> Channel 25 is the first FXS port on my Rhino CB.  It has a FAX directly
>>> attached to it.
>>>
>>> [channels]
>>> language                =  en
>>> switchtype              =  national
>>> signalling              =  pri_cpe
>>> pridialplan             =  national
>>> prilocaldialplan        =  national
>>> faxdetect               =  both
>>> echotraining            =  no
>>> echocancel
>>    =  256
>>> echocancelwhenbridged   =  no
>>> relaxdtmf               =  yes
>>> overlapdial             =  no
>>> usecallingpres          =  yes
>>> amaflags                =  default
>>> context                 =  default
>>> group                   =  1
>>> channel                 => 1-23
>>>
>>> signalling              = fxo_ls
>>> faxdetect               = both
>>> echotraining            = no
>>> echocancel              = no
>>> echocancelwhenbridged   = no
>>> relaxdtmf               = yes
>>> context                 = default
>>> callerid                = "FAX" <1112222>
>>> channel                 => 25
>>>
>>> Thanks for your assistance everyone!
>>>
>>>
>>>
>>> --- On Fri, 9/5/08, Bob Pierce <pierceb at westmancom.com> wrote:
>>> From: Bob Pierce <pierceb at westmancom.com>
>>> Subject: Re: [asterisk-users] FAX over
>>  T1 Question
>>> To: "Asterisk Users Mailing List - Non-Commercial Discussion"
>> <asterisk-users at lists.digium.com>
>>> Date: Friday, September 5, 2008, 4:43 PM
>>>
>>> On Fri, 2008-09-05 at 09:19 -0700, Amaru Netapshaak wrote:
>>>> I have a Sangoma A104d T1 card, a Rhino 24-port FXS box, and am
>>>> running
>>>> Asterisk 1.4.21.2
>>> I think you're mostly right on this setup, but I wonder if your A104d
>> is
>>> doing some hardware echo cancellation on these calls. If I'm not
>>> mistaken, that can mess up fax machine communications.
>>>
>>> Bob
>>>
>>>
>>>
>>>
>>>
>>>
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>> --
>> Consulting for Asterisk, Polycom, Sangoma, Digium, Cisco, LAN, WAN, QoS,
>> T-1, PRI, Frame Relay, Linux, and network design.  Based near
>> Birmingham, AL.  Now accepting clients worldwide.
>>
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-- 
Consulting for Asterisk, Polycom, Sangoma, Digium, Cisco, LAN, WAN, QoS, 
T-1, PRI, Frame Relay, Linux, and network design.  Based near 
Birmingham, AL.  Now accepting clients worldwide.