[asterisk-bugs] [JIRA] (ASTERISK-24680) Added FAXOPT(gateway)=t38 option

[adomjan (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-24680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=224443#comment-224443 ] 

adomjan commented on ASTERISK-24680:
------------------------------------

1.
 
 - the most gatways have configurable fax detection mode, cng and|or t38
| Telco | --- SIP trunk inband fax ---| asterisk | ----  | user gateways |
  - many user gateways have not realible IP connection
  - sume users have POS terminals it's better not trying T38, these GWs T38 mode off 
  - spare CPU cycles by avoiding the tone detection
  - I can reach a similar funkcionality whithout this patch. When I enable T38 on Telco SIP trunk, the gateway won't detect V.21. The user GW send T38 REINVITE, asterisk send T38 REINVITE to telco, refuse the TELCO and fall back inband, asterisk starts T38 fax gateway. Some case the fallback is not successful  due to the bug in system of the Telco.

2. I will check

3. I don't now... All these kind of case the GWs sent REINVITE to switch back from T38. You can reach it without this patch see last element of 1.


> Added FAXOPT(gateway)=t38 option
> --------------------------------
>
>                 Key: ASTERISK-24680
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-24680
>             Project: Asterisk
>          Issue Type: New Feature
>      Security Level: None
>          Components: Resources/res_fax
>    Affects Versions: 11.7.0
>            Reporter: adomjan
>            Assignee: adomjan
>            Severity: Minor
>         Attachments: res_fax.c-disable_v21_detection_on_gateway.patch
>
>
> Added faxgateway function without v21 preamble detection. The faxgateway starts only on T38 ReINVITE.



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