[asterisk-bugs] [JIRA] (ASTERISK-22790) check_modem_rate() may return incorrect rate for V.27

[Paolo Compagnini (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-22790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=212706#comment-212706 ] 

Paolo Compagnini commented on ASTERISK-22790:
---------------------------------------------


default minrate in res_fax.conf is 2400.
default modems is v17,v27,v29

but a rate of 2400 is only supported by v34, right ?

this means after applying my path the module cannot be loaded with the standard settings.

[Dec  9 14:24:31] ERROR[10367]: res_fax.c:3888 set_config: 'modems' setting 'V17,V27,V29' is incompatible with 'minrate' setting 2400
[Dec  9 14:24:31] ERROR[10367]: res_fax.c:4153 load_module: failed to load configuration file 'res_fax.conf'


since spandsp isn't always build with v34 support, minrate should be changed.

                
> check_modem_rate() may return incorrect rate for V.27
> -----------------------------------------------------
>
>                 Key: ASTERISK-22790
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22790
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_fax
>    Affects Versions: 11.6.0
>            Reporter: Paolo Compagnini
>            Severity: Minor
>         Attachments: res_fax.txt
>
>
> regarding to wikipedia(and others) "The new V.27ter and V.32 standards were able to transmit 4 bits per symbol, at a rate of 1,200 or 2,400 baud, giving an effective bit rate of 4,800 or 9,600 bit/s"
> so in case the rate is 2400 or 9600 the function may return the wrong  value.

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