Cisco Catalyst 3000, Administration Manual

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The connection group for redial and click-to-call depends on the outside dial code used during translation of
E.164 number to a national number. The administrator configures the outside dial code for redial and
click-to-call calls for each site.
Best Practices for Using DHCP for Acquiring IP Addresses
This document does not provide detailed information on DHCP; you should have a thorough understanding
of DHCP before you use it with your Cisco Business Edition 3000 system. Typically, the IT support staff for
the company or the Internet service provider handles your DHCP setup. DHCP may be run on a computer or
on a router. Before you implement DHCP with Cisco Business Edition 3000, consider the following best
practices:
• Use custom option 150 or option 66.
• You can use a DHCP server to issue IP addresses to the phones.
If DHCP is enabled on a phone, which is the default for the phone, DHCP automatically assigns an IP
address to the phone after you connect it to the network. The DHCP server directs the phone to the Cisco
Business Edition 3000 server, which serves a phone-specific configuration file to the phone.
If DHCP is not enabled on a phone, you must manually assign an IP address to the phone and configure
the IP address or the hostname of the Cisco Business Edition 3000 server locally on the phone (configure
it under the TFTP server option on the phone).
• The Cisco Business Edition 3000 server must use a static IP address that you assign to it. If you use a
DHCP server to issue IP addresses to computers and other network devices, make sure that the IP address
for the Cisco Business Edition 3000 server is not in the active range of IP addresses on the DHCP server.
Make sure that you configure your DHCP server so that it does not hand out the IP address for the Cisco
Business Edition 3000 server to a different network device.
• Cisco strongly recommends that you assign a static IP address to the gateway. If you use a DHCP server
to issue IP addresses to computers and other network devices, make sure that the IP address for the
gateway is not in the active range of IP addresses on the DHCP server. Make sure that you configure
your DHCP server so that it does not hand out the IP address for the gateway to a different network
device.
If DHCP is enabled on a gateway, DHCP automatically assigns an IP address to the gateway after you
connect it to the network.
• Before you configure your sites and DHCP, Cisco strongly recommends that you determine the number
of sites that you need and determine how many phones will be located at each site. Configure your
DHCP server so that it correctly distributes the IP addresses to the phones at the various sites.
For more information, see the following:
• Phone administration documentation that supports your phone model
• Sites, on page 39 (for subnet and subnet mask information for sites)
IP Addressing
The Cisco MCS7890-C1 uses two external IP addresses. The main IP address is the published IP address on
the MCS7890-C1 device. This is the system IP address of the Cisco Business Edition 3000. This IP address
is set by your administrator during the First Time Setup of Cisco Business Edition 3000. You can configure
this IP address using DHCP or static. The second IP address is the IP address of the media resource used for
Administration Guide for Cisco Business Edition 3000, Release 8.6(4)
32 OL-27022-01
Components of the Cisco Business Edition 3000 System