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VOIP Tunnel
The application VoipTunnel has been developed in order to enable
making VoIP phone calls for users who are behind firewalls that
block Voip traffic, especially in countries like UAE, Oman and some
other which have recently decided to delegalize internet telephony.
The use of VoipTunnel makes it possible to reduce the number of
ports necessary for VoIP communication to only one. VoipTunnel is
compatible with any hardware or software SIP clients, including, of
course, our SIPLink dialer. The VoipTunnel does not support H323.
The VoipTunnel consists of two parts:
- VoipTunnelServer - The server module which should be installed on
a computer with a public IP address from which it is allowed to
communicate with Voipswitch over SIP. In most cases, it is a server
where VoipSwitch has been installed.
VoipTunnelServer awaits the connections from clients on two separate
listeners, one for TCP and the other for UDP. The ports can be
defined by administrator. By default it is 1805 but when this port
happens to be blocked you can always change it to any other that
will work.
For the connections between the client and the VoipTunnelServer,
either TCP or UDP protocol can be used. The server receives packets
for both protocols, but in consideration for the quality and speed
it is recommended that UDP be used. On the other hand, the protocol
TCP enables to “pass through” even the most sophisticated blockades.
The properly working VoipTunnelServer should have all listeners
started and the value numbers in packet counters should increase as
the connections from clients are received. This is shown in the
image below
- VoipTunnelClient - small client's application to be
installed on a computer inside the local network on the customer's
side.Thus the IP phones or other SIP terminal adapters (like
linksys, cisco ATA etc.) can send SIP messages and media packets to
the VoipTunnelClient which in turn transfers them to VoipSwitch
server passing through the blockade.
The voiptunnelclient is already embeded in our softphone's
installation package and does not require any additional settings on
the customer's PC.
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