VOIP Can't hear vpn client on softphone

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armen10
Posts: 3
Joined: Thu Feb 18, 2021 11:27 am

VOIP Can't hear vpn client on softphone

Post by armen10 » Thu Feb 18, 2021 11:34 am

Hi, cannot hear vpn client while connected via VOIP.
The remote user can hear the caller, but the caller cannot hear the remote user. What is the problem here.
I will only add that I added a remote port 5060.
I would be grateful for help

solo
Posts: 37
Joined: Sun Feb 14, 2021 10:31 am

Re: VOIP Can't hear vpn client on softphone

Post by solo » Fri Feb 19, 2021 12:10 am

SIP phones use port 5060 for signalling only and other port/port-range for RTP voice.
Do they work properly directly on your LAN?
Where did you add "remote port 5060"?

armen10
Posts: 3
Joined: Thu Feb 18, 2021 11:27 am

Re: VOIP Can't hear vpn client on softphone

Post by armen10 » Fri Feb 19, 2021 11:47 am

Thanks for the answer, but when I'm on the local network it works, but when I connect via vpn and I'm on the local network, it doesn't work.
"Do they work properly directly on your LAN?" - Yes.

On the softether VPN server, I added the appropriate ports in iptales and nothing. Maybe I need to add some virtual ports?

iptables -I FORWARD -p udp -m multiport --dport 16384:32767 -j ACCEPT

solo
Posts: 37
Joined: Sun Feb 14, 2021 10:31 am

Re: VOIP Can't hear vpn client on softphone

Post by solo » Fri Feb 19, 2021 10:03 pm

I have not tried a Linux SoftEther server yet but here is my equivalent, working VOIP setup:
  • Ubuntu OpenVPN server in Layer 2 mode bridging LAN
  • a dozen LAN SIP phones
  • a few remote SIP phones
All phones are working fine and the only iptables rules are these:
  1. iptables -A INPUT -i tap0 -j ACCEPT
  2. iptables -A INPUT -i br0 -j ACCEPT
  3. iptables -A FORWARD -i br0 -j ACCEPT

solo
Posts: 37
Joined: Sun Feb 14, 2021 10:31 am

Re: VOIP Can't hear vpn client on softphone

Post by solo » Sat Feb 20, 2021 8:33 am

solo wrote:
Fri Feb 19, 2021 10:03 pm
I have not tried a Linux SoftEther server yet....
I have just tested a Linux SoftEther server (L2 mode) and confirm that SIP phones work fine with only the default, permissible, iptables' policies.

Later one should modify iptables to improve security, of course.

armen10
Posts: 3
Joined: Thu Feb 18, 2021 11:27 am

Re: VOIP Can't hear vpn client on softphone

Post by armen10 » Mon Feb 22, 2021 8:12 am

Yes, but I use L2PT because I don't want to use certificates. I need to use the built-in VPN client in Windows10.

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