[Linphone-users] [Bug] Wrong owner/connection address advertised in SDP on machines with multiple interfaces

[Jean-Pierre Höhmann]

Hi,

I have recently encountered a problem when trying to set up your 
softphone on a machine with multiple interfaces.

Under these circumstances, linphonec will advertise the wrong address 
(in this case 10.45.10.6), causing the connection to fail.

Searching the mailing list, I found two entries, that seem to describe 
the same problem, but neither presents a satisfactory solution.

Judging from answers to the existing reports, this might be a bug in 
a library used by Linephone, however I have too little knowledge of the 
project (and too little time to change that), to be able to directly 
file a bug there. I will, however, be happy to provide any additional 
information needed.

Participants:
Linphone:   172.23.130.6
Asterisk:   172.23.123.15

Routes on Client:
0.0.0.0/1 via 10.45.10.5 dev tun0 default via 172.23.123.2 dev wlp4s0
   src 172.23.123.111 metric 302
10.45.10.1 via 10.45.10.5 dev tun0
10.45.10.5 dev tun0 proto kernel scope link src 10.45.10.6
104.238.169.116 via 172.23.123.2 dev wlp4s0
128.0.0.0/1 via 10.45.10.5 dev tun0
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1
   linkdown
172.23.123.0/24 via 172.23.130.5 dev tun1
172.23.123.0/24 dev wlp4s0 proto kernel scope link src 172.23.123.111
   metric 302
172.23.130.0/24 via 172.23.130.5 dev tun1
172.23.130.5 dev tun1 proto kernel scope link src 172.23.130.6

Example dissect:
Frame 115: 864 bytes on wire (6912 bits), 864 bytes captured (6912 bits) 
on interface 0
Ethernet II, Src: Foxconn_0a:4a:b5 (00:15:58:0a:4a:b5), Dst: Vmware_3f:e7:2e 
(00:0c:29:3f:e7:2e)
Internet Protocol Version 4, Src: 172.23.130.6, Dst: 172.23.123.15
User Datagram Protocol, Src Port: 5060, Dst Port: 5060
Session Initiation Protocol (200)
   Status-Line: SIP/2.0 200 Ok
   Message Header
       Via: SIP/2.0/UDP 172.23.123.15:5060;branch=z9hG4bK270d5e65
           Transport: UDP
           Sent-by Address: 172.23.123.15
           Sent-by port: 5060
           Branch: z9hG4bK270d5e65
       From: "Wohn 1 DECT" <sip:address@hidden>;tag=as5d23c283
       To: <sip:address@hidden;transport=udp>;tag=2XkzQeq
       Call-ID: address@hidden:5060
       CSeq: 102 INVITE
       User-Agent: Linphonec/3.10.2 (belle-sip/1.5.0)
       Supported: replaces, outbound
       Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, 
SUBSCRIBE, INFO, UPDATE
       Contact: 
<sip:address@hidden;transport=udp>;+sip.instance="<urn:uuid:621bb133-c8a0-4187-9c3e-2738da633e73>"
       Content-Type: application/sdp
       Content-Length: 220
   Message Body
       Session Description Protocol
           Session Description Protocol Version (v): 0
           Owner/Creator, Session Id (o): 22 2995 462 IN IP4 10.45.10.6
               Owner Username: 22
               Session ID: 2995
               Session Version: 462
               Owner Network Type: IN
               Owner Address Type: IP4
               Owner Address: 10.45.10.6
           Session Name (s): Talk
           Connection Information (c): IN IP4 10.45.10.6
           Time Description, active time (t): 0 0
           Media Description, name and address (m): audio 7078 RTP/AVP 8 0 110 
101
           Media Attribute (a): rtpmap:110 speex/8000
           Media Attribute (a): fmtp:110 vbr=on
           Media Attribute (a): rtpmap:101 telephone-event/8000
           Media Description, name and address (m): video 0 RTP/AVP 0
           Media Attribute (a): inactive

Findings:
http://lists.nongnu.org/archive/html/linphone-users/2006-09/msg00025.html
http://lists.nongnu.org/archive/html/linphone-users/2012-02/msg00045.html

--
Thank you for your efforts,
Jean-Pierre Höhmann

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