The only configuration option you have for Skype is the port to be used for inbound
call requests from others, as shown in Figure 19-4. You can access the network
configuration in Skype by choosing Tools | Options | Connection. If the Skype service
cannot connect on this randomly assigned (at time of installation) port, it will try
ports 80 and 443. If you open the indicated port number, or another of your choice, on
your firewall, Skype should be able to use it for inbound calls.
Figure 19-2
Live Messenger offers
a simple connection
settings interface as well
as testing features to
help you get connected.
130 Project 19
Skype is flexible and effective but recommends opening both outgoing and
incoming UDP ports above 1024 (1024??“65536). Skype will work through a proxy
server, and uses the proxy settings, if any, that have been configured in Internet
Explorer.
Figure 19-3
Skype is a popular VoIP
application with an
intuitive user interface.
Figure 19-4
Skype??™s limited network
configuration options
make it simple to get
your call through.
Firewall Configurations for IM and Voice over IP 131
Firewall Settings for Packet8
Packet8 uses several outbound UDP ports, 5060??“65534. Few if any hardware firewalls
restrict outbound connections??”anticipating that you want to make these
connections??”but software firewalls may be suspicious of outbound connections they
do not ???know??? about. If you use a software firewall, and Packet8 fails to work, you
need to configure your firewall to allow the outbound UDP connections for the port
range 5060??“65534.
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