Chapter 4 Configuring the Application
Understanding Post-Installation Configuration Tasks
4-12
Cisco IP Communicator Administration Guide for Cisco CallManager
OL-4698-01
What Software VPN Clients are Supported?
Supported software VPN clients include Cisco Systems VPN Client 3.x or 4.x,
and the Microsoft PPTP client. Other third-party VPN clients might be
unsupported. A VPN solution is typically unsupported if it is not a Cisco product
and does not function like a network interface card.
Understanding how Cisco IP Communicator Obtains an Audio IP Address with a VPN
Software VPN clients are overlaid on top of an existing IP network, meaning that
there are essentially two IP addresses on the computer when a VPN is in use:
• The IP address from the underlying network
• The IP address provided by the VPN client that is used by parties on the other
side of the connection to communicate with applications on the computer
Some VPN clients, such as Cisco Systems VPN Client 3.x, assign the VPN IP
address at a very low level, which makes it difficult for Cisco IP Communicator
to specify the correct address. To eliminate this problem, Cisco IP Communicator
queries the Cisco VPN client directly.
Other VPN Clients, such as the Microsoft PPTP client and Cisco VPN Client 4.x
simply appear as alternative network interfaces. In these cases, the IP address can
be selected with the same auto-detection process that is used to resolve selection
when there are multiple interfaces.
Other third-party VPN clients might be unsupported and result in one-way audio.
Fix the problem by running the Cisco IP Communicator Administration Tool to
create a getIP.asp audio IP address reflector web page, then specify the URL for
the web page in Cisco CallManager Administration. Cisco IP Communicator will
attempt to fetch this reflector page rather than using other methods of
auto-detection. The reflector page returns the IP address from which it sees the
request originate, which is a relatively reliable way to identify
Cisco IP Communicator’s VPN IP address. See the opening paragraphs of this
section (Resolving Audio IP Address Auto-Detection Problems, page 4-11) for
more information on completing the getIP.asp tasks.
Related Topics
• An Overview of Post-Installation Configuration Tasks, page 4-2
• Selecting a Device Name, page 4-9
• Providing Password Information, page 4-13
• Configuring Settings for Remote Use, page 4-17
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