[asterisk-bugs] [JIRA] (ASTERISK-30015) pjsip / WebRTC: Chrome creating large number of SDP attributes

[Asterisk Team (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-30015?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Asterisk Team updated ASTERISK-30015:
-------------------------------------

    Target Release Version/s: 18.12.0

> pjsip / WebRTC: Chrome creating large number of SDP attributes
> --------------------------------------------------------------
>
>                 Key: ASTERISK-30015
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-30015
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: pjproject/pjsip
>    Affects Versions: 18.8.0, 18.11.1
>            Reporter: Josh Hogan
>            Assignee: Joshua C. Colp
>            Severity: Major
>              Labels: webrtc
>      Target Release: 16.26.0, 18.12.0
>
>
> Using the most recent chrome update (100.0.4896.75-1) when initiating a *video* call generates a longer SDP section for INVITE packets.
> This seems to exceed the upper limit of PJMEDIA_MAX_SDP_ATTR.
> Asterisk responds with a 400 response to the INVITE, and the call fails to start.
> Here are the asterisk error logs
> sdp.c .Error adding media attribute, attribute is ignored: Too many objects of the specified type (PJ_ETOOMANY)
> **repeats above error several times**
> sdp.c .Error adding media attribute, attribute is ignored: Too many objects of the specified type (PJ_ETOOMANY)
> sip_inv.c .Error parsing/validating SDP body: Missing SDP rtpmap for dynamic payload type (PJMEDIA_SDP_EMISSINGRTPMAP)`
> We noticed that on an older version of chrome (99.0.4844.84-1) the INVITE packet was not as long so the issue did not occur.
> When chrome was updated to the newest version (100.0.4896.75-1) we started getting these errors, and 400 responses from Asterisk.
> Here is a diff of the two INVITES https://www.diffchecker.com/GXFq5nYm
> Although the chrome update isn't necessarily the bad guy here, it was the catalyst that triggered this issue.
> I can confirm that the fix of increasing the PJMEDIA_MAX_SDP_ATTR did fix the issue and the errors no longer occurred.
> Temporary fix
> #define PJMEDIA_MAX_SDP_ATTR   (PJMEDIA_MAX_SDP_FMT*3 + 4)
> Here is a link to the discussion
> https://community.asterisk.org/t/invite-from-some-chrome-webrtc-clients-rejected-with-pjmedia-sdp-emissingrtpmap/92199/2



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