Information Technology Reference
In-Depth Information
2.
Select a server and, in the Server Configuration page, change the value of the Host-
name/IP Address field from the hostname to the host's IP address, as shown in
Figure 10-3.
Figure 10-3
Hostname Changed to IP Address in Server Configuration Page
3.
Click Save.
4.
Repeat the previous steps for each server.
The next configuration task is similar, but carried out under System > Enterprise Parame-
ters. Scroll to the section titled
Phone URL Parameters
(shown in Figure 10-4), and in
each field, change the URL to use the host IP address instead of the hostname.
Note:
The elimination of DNS reliance is recommended for IP phones, but there are some
circumstances where it is useful, including when changing IP address schemes (when the
DNS name stays stable, but the IP address it represents changes). The integration of Cisco
Unified Presence Server (CUPS) with CUCM requires DNS service, but this might not
affect the hardware IP phones. If DNS is used, it must be correctly managed and main-
tained so that it does not cause failures.
Centralized Remote Branch Call Flow
In a centralized deployment, the CUCM servers are located at the main location, with one
or more locations at remote branches, connected by an IP WAN. The branch-office IP
phones use the IP WAN for both signaling and on-net voice traffic. Off-net calls from
