3Com NBX, Installation Manual

Page: 185 / 248

Configuring IP Telephony 185
you needed to initialize the card by connecting it to the same subnet as
the NCP if you were installing the card on a subnet that was remote from
the system’s NCP. With NBX R6.0 or higher, these cards support DHCP
option 184.
3C10165D E1 Digital Line Cards and 3C10116D T1 Digital Line Cards do
not support DHCP lease times of less than 20 minutes.
Manually Configuring
Telephone IP Settings
If a phone is located on a different subnet from the NCP, the phone and
the NCP cannot communicate with each other until the telephone is
configured with its own IP settings and the IP address of the NCP. After
the telephone can communicate with the NCP, you can use the NBX
NetSet utility to change the device IP settings. If you first connect the
telephone to the same subnet as the NCP, the telephone receives and
retains the NCP IP information required to communicate with the NCP
when the telephone is moved to a different subnet.
To edit telephone IP settings with the NBX NetSet utility:
1 Connect the telephone to the same subnet as the NCP.
If the telephone has not already been discovered by the NCP, click
System-wide Settings > Auto Discovery and enable Auto Discover
Telephones .
2 Log in to the NBX NetSet utility using the administrator name and
password.
3 Click Telephone Configuration > Telephones .
4 Select the telephone from the list by clicking its extension. If you are not
sure which telephone to select, match the MAC address with the MAC
address printed on the label on the bottom of the telephone.
5 When the Modify page opens, click the IP Settings dialog box appears.
(The IP Settings button does not appear unless you have enabled IP for
the system.)
6 In the IP Settings dialog box, specify the IP settings for this device. The IP
Settings dialog box shows two groups of IP settings:
■
IP Settings Reported by Device — Typically, if you are configuring a
new telephone, you see 0.0.0.0 in each of the IP address, Default
Gateway, and Subnet Mask fields. Note that if a telephone has an IP
address, default gateway, and subnet mask, you cannot change those
values using the NBX NetSet utility.