Re: No audio Over VPN

Have you tried other softphones? Had a similar issue with MicroSIP over NAT
(not using docker) and when using Zoiper all worked fine.
I have always used MicroSIP, but sometimes, it can be tricky....

Atenciosamente / Kind Regards / Cordialement / Un saludo,


*Sérgio Charrua*



On Mon, Jul 28, 2025 at 6:22 PM Fernando Lopes via sr-users <
[email protected]> wrote:

> Hello everyone,
>
> I'm having some issues with SIP when the VPN is active.
> I'm running a Docker container inside WSL. My WSL IP is 172.31.217.74, and
> my machine's IP is 192.168.1.77. When I connect to the VPN, I get the IP
> 192.168.1.129.
>
> When I place a call, I see this log. I've tried disabling ICE, setting the
> public IP of the SIP server in MicroSIP, and manually specifying my local
> machine IP. This does change the c= and a= parameters in the SDP, but it
> still doesn't work.
>
> Everything works fine without the VPN. I need the VPN active to access
> certain endpoints, but SIP stops working once it's connected.
>
> INVITE sip:100@localhost;transport=tcp SIP/2.0
> Via: SIP/2.0/TCP 172.31.208.1:54367
> ;rport;branch=z9hG4bKPjb591721e91454d2bae56a9edfc645ebe;alias
> Max-Forwards: 70
> From: "6001" <sip:6001@localhost>;tag=daa078657d2949e68935f308beeb8b89
> To: <sip:100@localhost>
> Contact: "6001" <sip:[email protected]:54367;transport=TCP;ob>;+sip.ice
> Call-ID: 49c169a9e92d4b23ad70709636ccab4f
> CSeq: 13400 INVITE
> Route: <sip:172.31.217.74;transport=tcp;lr>
> Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY,
> REFER, MESSAGE, OPTIONS
> Supported: replaces, 100rel, timer, norefersub
> Session-Expires: 1800
> Min-SE: 90
> User-Agent: MicroSIP/3.21.6
> Content-Type: application/sdp
> Content-Length:  1345
>
> v=0
> o=- 3962710251 3962710251 IN IP4 192.168.1.129
> s=pjmedia
> b=AS:84
> t=0 0
> a=X-nat:0
> m=audio 4030 RTP/AVP 8 0 96 97 98 9 99 100 101 102 103
> c=IN IP4 192.168.1.129
> b=TIAS:64000
> a=rtcp:4001 IN IP4 192.168.1.129
> ...
> a=ice-ufrag:1d266809
> a=ice-pwd:2f7e2ef6047a47d832ed0f55
> a=candidate:Hc0a80181 1 UDP 2130706431 192.168.1.129 4030 typ host
> a=candidate:Hc0a8014d 1 UDP 2130706175 192.168.1.77 4030 typ host
> a=candidate:Hc0a83801 1 UDP 2130705919 192.168.56.1 4030 typ host
> a=candidate:Hac1fd001 1 UDP 2130705663 172.31.208.1 4030 typ host
> a=candidate:Hc0a80181 2 UDP 2130706430 192.168.1.129 4001 typ host
> a=candidate:Hc0a8014d 2 UDP 2130706174 192.168.1.77 4001 typ host
> a=candidate:Hc0a83801 2 UDP 2130705918 192.168.56.1 4001 typ host
> a=candidate:Hac1fd001 2 UDP 2130705662 172.31.208.1 4001 typ host
>
> Does anyone know where the problem may be?
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