[Freeswitch-users] RTP Over VPN Split Tunnel

[Peter]

This is not a direct FreeSWITCH question, but was hoping someone might have
set up a similar configuration.

Currently I have a FS server where SIP clients (Linphone) register to via a
Cisco AnyConnect VPN.  I have inbound-bypass-media set to true so that RTP
traffic is peer to peer.


If I tunnel all traffic, the SIP transport and RTP media works just fine.

If I set up a VPN split tunnel that allows the subnets of the VPN client
and the FS server, the SIP signalling is fine, but in the SDP, it specifies
a non VPN address, eg:

INVITE sips:1004 at 10.1.1.204;transport=udp SIP/2.0
   Via: SIP/2.0 10.1.254.36:53036;branch=z9hG4bK.GRrzYXeCN;rport
   From: <sip:1001 at 10.1.1.204>;tag=cN83ZcmHw
   To: sip:1004 at 10.1.1.204
   CSeq: 20 INVITE
   Call-ID: e7eEYxoML2
   Max-Forwards: 70
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE,
SUBSCRIBE, INFO
   Content-Type: application/sdp
   Content-Length: 426
   User-Agent: LinphoneAndroid/2.1.2-177-g015b83c (belle-sip/0.0.1)
   Contact: <sip:1001 at 10.1.254.36:53036
;transport=udp>;+sip.instance="<urn:uuid:83c4b823-9c0d-4e02-b7f7-cdd3ae2f1259>"

   v=0
   o=1001 3921 1865 IN IP4 [ISP address]
   s=Talk
   c=IN IP4 [ISP address]
   b=AS:380
   t=0 0
   m=audio 1031 RTP/SAVP 0 8 100 101
   a=rtpmap:100 iLBC/8000
   a=fmtp:100 mode=30
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-11
   a=rtcp:7079 IN IP4 [wireless IP address]


I'm not very familiar with how the SDP is constructed, but I'm assuming
that it's the SIP client that's responsible for offering it's IP addresses.

Are there any FreeSWITCH settings that would affect the IP addresses in the
SDP?

Thanks

Peter
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