[asterisk-bugs] [JIRA] (ASTERISK-22842) V29 is incompatible with minrate setting 2400

[Matt Jordan (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-22842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=211687#comment-211687 ] 

Matt Jordan commented on ASTERISK-22842:
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A quick google:

{quote}
V.29 Fax modem software (V29 fax softmodem)

GAO V.29 fax modem software implements the ITU-T V.29 Recommendation, which provides full-duplex data transmission at rates of 9600, 7200, and 4800bps over 4-wire leased lines. GAO's V29 modem data pump software has "quick connect" feature. It is also the modulation technique used in Group 3 fax (G3 fax) for fax data transfer at 9600bps and 7200bps on 2-wire lines. It consists of transmitting functions and receiving functions which are called to transmit/receive bits in groups of 2 or 3 (referred to as symbols) at rates of 1200 or 1600 symbols per second respectively. More
{quote}

So no, a bit rate of 2400 is not allowed for that rate. The minrate specified in the configuration file is a 'global' minimum rate for all modems; that doesn't mean that it will be chosen for a specific modem.

                
> V29 is incompatible with minrate setting 2400
> ---------------------------------------------
>
>                 Key: ASTERISK-22842
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22842
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_fax
>    Affects Versions: 1.8.14.0
>         Environment: Wheezy
>            Reporter: Thomas Rechberger
>            Severity: Trivial
>
> Get the following error:
> ERROR[8432]: res_fax.c:2086 sendfax_exec: 'modems' setting 'V29' is incompatible with 'minrate' setting 2400
> I am using default options in res_fax.conf:
> minrate = 2400
> modems = V17,V27,V29
> When i put in dialplan FAXOPT(modem)=V29 to force using V29 (because V17 is not able to send with 9600baud), then i get the error above. Does this mean if the default order is V17,V27,V29 then V29 can never be used because the min bitrate is always to low?
> And why is V29 then not using bounds of maxrate?

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