[Freeswitch-users] RTP Over VPN Split Tunnel

[Veniamin (Benjamin) Beskrovny]

http://wiki.freeswitch.org/wiki/Codec_negotiation#Rewriting_SDP maybe?

On 9/5/13, Peter <eidevm5 at gmail.com> wrote:
> 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
>