[asterisk-bugs] [JIRA] (ASTERISK-29842) Do not change 180 Ringing to 183 Progress even if early_media already enabled

[Mark Petersen (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-29842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=257661#comment-257661 ] 

Mark Petersen commented on ASTERISK-29842:
------------------------------------------

this issue is a large problem if you have an asterisk PBX with an asterisk GW in front and the GW first receive an 183 Progress with SDP
and thereafter receive and 180 Ringing, the asterisk PBX will not receive any 180 Ringing preventing AMI from indicating that the remote endpoint is Ringing

> Do not change 180 Ringing to 183 Progress even if early_media already enabled
> -----------------------------------------------------------------------------
>
>                 Key: ASTERISK-29842
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-29842
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_pjsip
>    Affects Versions: 16.23.0, 18.9.0, 19.1.0
>            Reporter: Mark Petersen
>
> Currently if we receive a 180 Ringing and we previously have received a 183 Progress with SDP, asterisk is send as 183 Progress with SDP
> but it should be send as 180 Ringing with SDP
> RFC-3960 3.2.  Ringing Tone Generation
> SIP User Agent (UA) could implement the following
>    local policy:
>       1. Unless a 180 (Ringing) response is received, never generate
>          local ringing.
>       2. If a 180 (Ringing) has been received but there are no incoming
>          media packets, generate local ringing.
>       3. If a 180 (Ringing) has been received and there are incoming
>          media packets, play them and do not generate local ringing.
>          Note that a 180 (Ringing) response means that the callee is
>          being alerted, and a UAS should send such a response if the
>          callee is being alerted, regardless of the status of the early
>          media session.



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