Create a VPN Based VOIP Communication for Mobile Users

We have 2 sophos firewall installed XG115, now in the network we have IPPBX installed behind the firewall at 2 locations as enclosed is the network map below.

Now as it can be seen that both firewalls are connected through an IP-SEC Tunnel and both the firewalls have an IPPBX behind them. Now the issue is that when we connect from a mobile user through VPN, the mobile user is able to connect to the IP-PBX and register but there seems to be an issue with voice, the issue is that the mobile user is able to hear voice of user1 or user2 but the user1 or user2 is unable to hear mobile users.

Also note that user1 and user2 are able to communicate to each other easily without any issues.

The requirement for this small project is as below:

1. Both user1 and user2 should be able to communicate to each (as is the case currently)

2. Mobile Users would install an app in their mobile phones and connect to the IP-PBX on [login to view URL]

3. Mobile users should be able to speak to user1 or user2 without issues (as explained this is the problem).

4. Mobile user if connected to the network from within should be able to still communicate.

5. Ideally the VPN should be seamless meaning should be always connected to the server and there should not be any need for making changes if the mobile user comes inside the main network.

Forgot to mention:

There are small offices outside of the 2 network and they would need to be linked to the existing using VPN only. The project person should also suggest a seamless way to connect other offices to the main office with VPN, the other office locations don't have firewalls but only simple ROUTERS, so which routers would be need for them to connect to the main office via VPN so that their extensions can also be linked to the server1.

Skills: Asterisk PBX, Linux, Network Administration, System Admin, VoIP

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About the Employer:
( 0 reviews ) New Delhi, India

Project ID: #17805422

10 freelancers are bidding on average $298 for this job


Its seems like Firewall or NAT issue However, are you using vlan to Voip connections ? Voip should be isolated to LAN IPSec its the best way to interconect these offices, even if there are not Firewall ( ipsec perfor More

$250 USD in 3 days
(3 Reviews)

Hello, I can work on vpn based voip communication development. Please share some more details over chat. Thanks Nishchal

$616 USD in 25 days
(2 Reviews)

Hello! I've used OpenVPN (udp protocol, tun mode) for such situations. This will allow it to be installed on mobile devices.

$55 USD in 3 days
(2 Reviews)

Hi, I am security consultant with VoIP skills. I have expertise in Sophos with most recent project in an implementation of a XG-310 High Availability cluster. Please, let me know more details about your infrastru More

$150 USD in 10 days
(1 Review)

Hi Greetings... we are specialized Web, ERP application and mobile development and customization company working extensively on cloud, voip, erp web and app development and worked on many small to large scale projec More

$555 USD in 7 days
(0 Reviews)

I am a IT networking and security professional with 5 years of experience in design, installation, configuration and troubleshooting of IT solutions. I have setup and done troubleshooting for switches, routers, firewal More

$170 USD in 5 days
(0 Reviews)

Asterisk Certified, Familiar with Cisco UCM. Experience with Scopserv/FreePBX/Freeswitch. Currently work in a Metaswitch environment. Deployed several hundred voip PBX's for customers all over the world. Sophos More

$666 USD in 3 days
(0 Reviews)

It is a simple problem of the SIP protocol. the subject that I handle with the English language rustically if you have no problem with this I will gladly help you

$155 USD in 10 days
(0 Reviews)

Hi This is Mostafa Safwat, i have 10 Years experience on Network and Network security solutions ( UTM / NGFW / NGIPS / GTP Firewall / IPSEC etc... ) Thanks,

$166 USD in 4 days
(0 Reviews)

I will need to look at your configurations on the ippbx and app setting, what ippbx you are using before the start of this project and I can tell you whether I can guarantee to fix your problem. Otherwise whoever claim More

$200 USD in 10 days
(0 Reviews)