User guide

Internet 227
Frequently Asked Questions
Internet
Question: I cannot access our company Web site.
Outside your system, your company Web site is accessed at
“www.firm.com”, but in the Configurator you have entered
“firm.com” as the domain. Your company’s site URL thus counts
as an internal URL and can only be accessed by entering the direct
IP address. If required, change the domain setting in the Net-
work: LAN menu.
Question: Why do some Internet services not work even though
they can be used when dialling in directly via a modem?
Some Internet services require an active connection coming from
the Internet. But the configured filter rules prevent this. Plus, it is
not possible to establish incoming Internet connections with the
PCs directly owing to the network address translation process.
It is possible to redirect incoming connections in the Configura-
tor, menu Network: Port Forwarding. You should secure the
redirection target (PC or server) with a suitable firewall software.
Question: A SIP connection only passes unidirectional voice.
What is the reason?
You did not use the Forum 523/524 as internet router or the STUN
server of the SIP provider is unavailable. You need to activate the
SIP support at your internet router, such as “SIP-ALG” or “Full
Cone NAT” functions. You can also use the Forum 523/524 for
internet access. Correct the STUN setting in the Telephony:
Trunks: SIP Provider menu.
Question: Is it possible to use Q.SIG-IP connections via an
Internet access with dynamic IP address?
Q.SIG-IP connections require a fixed IP assignment for technical
and security reasons. Therefore you need an Internet access with
a fixed IP address. It is possible to tunnel a Q.SIG-IP connection
through a VPN connection. A VPN connection offers the possibility
to determine the peer’s IP address with a DynDNS service during
connection setup. VPN and DynDNS can be realized with external
servers or routers also.