[asterisk-bugs] [JIRA] (ASTERISK-28208) chan_pjsip: 183 without SDP followed by 180 does not result in media

[Julien (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-28208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=246829#comment-246829 ] 

Julien commented on ASTERISK-28208:
-----------------------------------

i add, if the first "183 Session Progress (without SDP)" is with or without SDP, Asterisk will send 2 Session Progress...
https://issues.asterisk.org/jira/browse/ASTERISK-28185

> chan_pjsip: 183 without SDP followed by 180 does not result in media
> --------------------------------------------------------------------
>
>                 Key: ASTERISK-28208
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28208
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_pjsip
>    Affects Versions: 13.23.1
>         Environment: Centos 6
>            Reporter: Michael Maier
>            Severity: Minor
>              Labels: pjsip
>         Attachments: missing-ringback, missing-ringback.pcapng
>
>
> An extension registered at Asterisk 13.23 initiates an external call (pjsip). After the Invite, the
> callee (-> ISP) sends a
> 	100 Trying
> 	183 Session Progress (*without* SDP)
> Asterisk now sends to the extension:
> 	183 Session Progress (*with* SDP)
> 	183 Session Progress (*with* SDP) (really two times)
> 	
> The callee meanwhile sends
> 	180 Ringing (*without* SDP)
> which is "forwarded" by Asterisk to the extension with
> 	180 Ringing (*with* SDP)
> The problem: The extension doesn't create a ringback locally, because it most probably expects it to
> be sent by the callee - but the callee doesn't send anything (not surprising, because there has been
> no SDP).



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