[asterisk-bugs] [JIRA] (ASTERISK-23020) PJSip - Multihomed machine returning wrong IP address

[Joshua Colp (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-23020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=213592#comment-213592 ] 

Joshua Colp commented on ASTERISK-23020:
----------------------------------------

This should just be made a general multi-homing issue for pjsip. There's two things in place:

1. If we bind to any (0.0.0.0) we should adjust signaling accordingly depending on which interface the message ends up going out on.
2. If multiple transports are configured and none is explicitly locked we should determine which interface the message should go out on and send it out accordingly/change the message.

Both of the above can use the pj_getipinterface function to get the information.
                
> PJSip - Multihomed machine returning wrong IP address
> -----------------------------------------------------
>
>                 Key: ASTERISK-23020
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-23020
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_pjsip
>    Affects Versions: 12.0.0-beta2
>            Reporter: xrobau
>         Attachments: sip_trace.txt
>
>
> Multihomed machine has two interfaces:
> eth0.10 = 192.168.15.5/24  (default gateway via this int)
> eth0.20 = 192.168.5.247/24 
> Phone endpoint is connected to eth0.20, with the IP Address 192.168.5.248
> Connecting works fine, but in the OK packet returned from the server, the wrong IP address is handed back:
> {noformat}
>         v=0
>         o=- 7132004 7132006 IN IP4 localhost.localdomain
>         s=Asterisk
>         c=IN IP4 192.168.15.5
>         t=0 0
>         m=audio 17940 RTP/AVP 8 101
>         c=IN IP4 192.168.15.5
>         a=rtpmap:8 PCMA/8000
>         a=rtpmap:101 telephone-event/8000
>         a=fmtp:101 0-16
>         a=ptime:20
>         a=maxptime:150
>         a=sendrecv
> {noformat}
> This causes the phone to try to connect to the wrong IP address which is not reachable from the other network.
> Larger TCPdump attached

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