[asterisk-bugs] [JIRA] (ASTERISK-21955) Asterisk responds 488 to session timers re-Invite in an active T.38 dialog after exactly 5 seconds

[Rusty Newton (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-21955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=226623#comment-226623 ] 

Rusty Newton commented on ASTERISK-21955:
-----------------------------------------

Torrey do you want to put that patch on Gerrit? Maybe it will simply work in 13 as well, and if not maybe someone else will port it once it is on there.

> Asterisk responds 488 to session timers re-Invite in an active T.38 dialog after exactly 5 seconds
> --------------------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-21955
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21955
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/T.38
>    Affects Versions: 1.8.22.0
>            Reporter: i2045
>         Attachments: Asterisk_1.8.22.0_T.38_488_sip-conf_relevant.txt, Asterisk_1.8.22.0_T.38_488.txt, t38_session_timer.patch
>
>
> 192.168.5.1 LAN IP address of client A
> 44.55.66.77 WAN IP address of client A
> 11.22.33.44 SIP proxy server
> 88.99.11.22 Asterisk 1.8.22.0 server
> 33.55.77.99 SIP server of client B
> 22.44.66.88 Media gateway of client B
> - A call (G.711 alaw) is initiated by client A to client B.
> - Client A re-Invites to T.38, Asterisk relays this re-Invite, client B accepts.
> - Client B re-Invites (line #502). The only difference with the 200 OK that client B sent earlier (line #404) is the Session-Expires header. Asterisk responds immediately with "100 Trying" and "488 Not acceptable here" after exactly 5 seconds.
> - The call is then re-Invited back to G.711 alaw and the fax fails.
> Seems a similar problem as reported in 2010:
> https://issues.asterisk.org/jira/browse/ASTERISK-15596?focusedCommentId=162618&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-162618
> Does someone know why the second re-Invite is answered with a 488?



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