[asterisk-users] Where are the fax instructions?

[Kevin P. Fleming]

On 01/05/2012 01:03 AM, José Pablo Méndez Soto wrote:
> Hello,
>
> Trying to set up res_fax_spandsp. Based on
> https://wiki.asterisk.org/wiki/display/AST/T.38+Fax+Gateway I wrote this
> in my extensions.conf:
>
> exten => 306,1,NoOp(Fax transmission)
>      same => n,Set(FAXOPT(gateway)=yes)
>      same => n,Dial(DAHDI/3)            ----->FXS port to fax machine
>      same => n,Hangup()
>
> Call flow Im trying to pull out is as follows:
>
> Zoiper  -->  Asterisk with TDM410 --> FXS --> Analog fax machine
>
> I am totally lost about the use of this new gateway module in the
> dialplan. I think it loads ok:
>
> CLI> fax show capabilities
>
> Registered FAX Technology Modules:
>
> Type            : Spandsp
> Description     : Spandsp FAX Driver
> Capabilities    : SEND RECEIVE T.38 G.711

Your res_fax_spandsp module was built without gateway support; what 
version of Asterisk are you using?

>
> 1 registered modules
>
> Also I have the FFA manual, which I couldn't understand. I think FAXOPT
> is common to both, but still not sure how to put them together. Where
> can I find documentation about configuring the call flow described?

Fax for Asterisk is totally unrelated to T.38 gateway support.

> Or some insight will also be appreciated.
>
> Here is my sip peer config:
>
> [105](headquarters) ;zoiper phone
> type=friend
> secret=
> mailbox=105 at default
> t38pt_udptl = yes
>
> Dahdi:
> ;FXS Modules
> group = 2
> signalling = fxo_ks
> context = interno
> channel = 3-4
> faxdetect = both
>
> Finally, a verbose output:
>
>    == Using SIP RTP CoS mark 5
>      -- Executing [606 at intern:1] NoOp("SIP/105-00000002", "Fax
> Transmission") in new stack
>      -- Executing [606 at intern:2] Set("SIP/105-00000002",
> "FAXOPT(gateway)=yes") in new stack
> [Jan  5 00:59:57] WARNING[1831]: res_fax.c:2783 acf_faxopt_write:
> channel 'SIP/605-00000002' set FAXOPT(gateway) to 'yes' is unhandled!
>      -- Executing [606 at intern:3] Dial("SIP/605-00000002", "DAHDI/3") in
> new stack
>      -- Called DAHDI/3
>      -- DAHDI/3-1 is ringing
>      -- DAHDI/3-1 is ringing
>      -- DAHDI/3-1 is ringing
>      -- DAHDI/3-1 answered SIP/605-00000002
>      -- Hanging up on 'DAHDI/3-1'
>      -- Hungup 'DAHDI/3-1'
>    == Spawn extension (intern, 606, 3) exited non-zero on 'SIP/105-00000002'

Since 'fax show capabilities' did not show that you have gateway 
support, you won't be able to enable it. That problem must be corrected 
first.

-- 
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