[asterisk-bugs] [JIRA] (ASTERISK-27162) Access incoming SIP REFER headers in the dialplan

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=237878#comment-237878 ] 

Asterisk Team commented on ASTERISK-27162:
------------------------------------------

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> Access incoming SIP REFER headers in the dialplan
> -------------------------------------------------
>
>                 Key: ASTERISK-27162
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27162
>             Project: Asterisk
>          Issue Type: New Feature
>      Security Level: None
>          Components: Channels/chan_sip/NewFeature, PBX/NewFeature
>    Affects Versions: GIT
>            Reporter: Kirill Katsnelson
>
> This has been requested every so infrequently but steadily (e. g. https://community.asterisk.org/t/how-to-send-variable-information-via-sip-header/70178 for a fairly recent request). Now we are stuck without it too. An obvious hack-around that we once used is pack more data into 
> Feature description I am putting into the Git comment that explains it:
> ----
> This adds a way to access information passed along with SIP headers in a REFER message that initiates a transfer. Headers matching a dialplan variable GET_TRANSFERRER_DATA in the transferrer channel are added to a HASH object TRANSFER_DATA to be accessed with functions HASHKEY and HASH.
> The variable GET_TRANSFERRER_DATA is interpreted to be a prefix for headers that should be put into the hash. If not set, no headers are included. If set to a string (perhaps 'X-' in a typical case), all headers starting this string are added. Empty string matches all headers.
> If there are multiple of the same header, only the latest occurrence in the REFER message is available in the hash.
> Obviously, the variable GET_TRANSFERRER_DATA must be inherited by the referrer channel, and should be set with the '_' or '__' prefix.
> I avoided a specific reference to SIP or REFER, as in my mind the mechanism can be generalized to other channel techs.
> ----
> I would appreciate comments on the feature and ways to possibly implement it better. I do not expect it to be used widely, but as is it is fairly cryptic. I posted a message asking for dev's thoughts on it (as a cross-reference): http://lists.digium.com/pipermail/asterisk-dev/2017-July/076419.html
> I'll submit a patch on Gerrit later today.



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