[asterisk-bugs] [JIRA] (ASTERISK-17540) SDP origin attribute modified when issuing re-INVITE because of directmedia=yes

[saghul (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-17540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=203294#comment-203294 ] 

saghul commented on ASTERISK-17540:
-----------------------------------

Look carefully, the IP address is also changed, which is not right according to the RFC extract I referenced.
                
> SDP origin attribute modified when issuing re-INVITE because of directmedia=yes
> -------------------------------------------------------------------------------
>
>                 Key: ASTERISK-17540
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-17540
>             Project: Asterisk
>          Issue Type: Bug
>          Components: Channels/chan_sip/Interoperability
>            Reporter: saghul
>            Severity: Minor
>         Attachments: asterisk_r310240_sip_reinvite_modified_origin.txt
>
>
> When directmedia=yes is set Asterisk will generate a re-INVITE with a new SDP offer to both parties. This offer must not modify the SDP origin attribute (o=) but for the version number. Extract from RFC3264, sec 8:
> "When issuing an offer that modifies the session,
>   the "o=" line of the new SDP MUST be identical to that in the
>   previous SDP, except that the version in the origin field MUST
>   increment by one from the previous SDP."
> The attached SIP trace from the CLI shows the described behavior.

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