Hi ,
First check your link fax enable or not .
On Fri, Aug 5, 2011 at 11:21 PM, Kevin P. Fleming <kpfleming at digium.com>wrote:
> On 08/05/2011 12:06 PM, Robert Thomas wrote:
>
> I'm refering to the audio hook implemented to the detect the V21
>> preamble fax on the T38 gateway implementation on asterisk 1.10.
>>
>> I think it depens whether they refer to fax detection to disable echo
>> cancellation, or to renegotiate to T38.
>>
>
> Neither. In most cases, 'FAX detection' in Asterisk used to to redirect the
> channel to a different extension in the dialplan. This is done by detecting
> CNG, so that the destination of the call can be changed to one that is able
> to handle the FAX transaction. Asterisk does not handle echo canceller
> reconfiguration for FAX at all; that's done by DAHDI or the echo cancellers
> themselves.
>
>
> Is the fax audio hook detection responsibility of the channel used,
>> chan_dahdi or chan_ss7?
>>
>
> CNG detection is the responsibility of the channel driver; V.21 preamble
> detection is handled by the FAX gateway code, and can be used on any channel
> type.
>
>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at www.digium.com & www.asterisk.org
>
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