[asterisk-bugs] [JIRA] (ASTERISK-21876) Bridge API Enhancements - add CHANNEL(dtmf-features)=[tkhwx] feature

[Jonathan Rose (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-21876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on ASTERISK-21876 started by Jonathan Rose.

> Bridge API Enhancements - add CHANNEL(dtmf-features)=[tkhwx] feature
> --------------------------------------------------------------------
>
>                 Key: ASTERISK-21876
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21876
>             Project: Asterisk
>          Issue Type: Improvement
>      Security Level: None
>          Components: Core/Bridging
>            Reporter: Matt Jordan
>            Assignee: Jonathan Rose
>              Labels: Asterisk12
>      Target Release: 12
>
>
> Features are typically added to a channel by an application. This includes the ability to hangup via one touch hangup; transfer the call; park the call; etc.
> Ideally, we would be able to set the ability for a channel to perform these functions via a function call. While the {{FEATURE}} and {{FEATUREMAP}} functions let you set the DTMF key to enable a feature and the properties of certain features, they don't actually enable the feature on the channel - that still has to be done by the Dial, Bridge, Queue, or other application.
> This function should:
> * Enable or disable the DTMF features on a channel when set
> ** Setting options should remove all previous options and set the options specified
> ** If no options are specified, all options are removed
> * Retrieve the DTMF features set on a channel when read
> Because we can execute pre-dial and pre-bridge handlers on a channel, this only needs to account for the settings for the 'caller' channel, not the 'callee/peer'. Thus, the lower-case options are sufficient to be specified via the function.
> The syntax should be:
> {{CHANNEL(dtmf-features)=[tkhwx]}}
> *NOTE*
> This addresses the following *BUGBUG* comment in trunk:
> {{./funcs/func_channel.c: * BUGBUG add CHANNEL(dtmf_features)=tkhwx sets channel dtmf features to specified. (transfer, park, hangup, monitor, mixmonitor)}}

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