[asterisk-bugs] [JIRA] (ASTERISK-25360) chan_sip:wrong ice candidate fails html5client on mobile connection

[Fabrizio Lombardozzi (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-25360?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Fabrizio Lombardozzi updated ASTERISK-25360:
--------------------------------------------

    Attachment: chan_sip-asterisk_13.7.0_webrtc_forced_use_of_media_address_.diff

I propose this patch to _kindly suggest_ {{chan_sip.c  add_ice_to_sdp()}} function to use *{{media_address}}* as specified in {{sip.conf}}


> chan_sip:wrong ice candidate fails html5client on mobile connection
> -------------------------------------------------------------------
>
>                 Key: ASTERISK-25360
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25360
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/WebSocket, Resources/res_pjsip
>    Affects Versions: 13.4.0, 13.5.0
>         Environment: server: Centos 6.7
> client: Ubuntu, Windows, Android with Chrome 44 and Firefox 40, sipML5, SIP.js
>            Reporter: Fabrizio Lombardozzi
>         Attachments: chan_sip-asterisk_13.7.0_webrtc_forced_use_of_media_address_.diff, full_bad.txt, rtp.txt, sip.log, sip.txt
>
>
> Scenario:
> {noformat}
> asterisk server  <--nat--> internet <--nat--> html5client
> {noformat}
> Systematically, when using webrtc, chan_sip.c:add_ice_to_sdp() chooses only LAN_ADDRESS of the server, so the SDP INVITE reply reports only candidate addresses that the client can't reach (see log)
> "sip show settings" cli command reports that PUBLIC_ADDRESS specified sip.conf and local subnets, are set properly, even media_address is set  to PUBLIC_ADDRESS.
> Tcpdump running on the server reports no traffic to the stun server specified in rtp.conf
> In addition is to consider that the issue becomes actual only if the client uses a mobile connection (or is a mobile device using mobile connection), in all the other cases (pc with adsl router, mobile device with wifi-adsl) the client "understand" (don't know how or why) that is better to use the address specified in the sip header (or maybe where the traffic comes from).
> Brutely forcing PUBLIC_ADDRESS in add_ice_to_sdp() of chan_sip.c source code made the call possible from 3g mobile also.
> Multiple clients tested with sipML5, SIP.js in Firefox 40, Chrome44, on linux, windows and android with identical results.



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