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Issue 2.2 April 2005 59
8. Define the subnet mask in one of two ways:
● The number of bits of an IP Address to use for the network/subnet IDs.
● The subnet mask IP Address.
Enter only one of these values. When you finish, click the Next button.
The Add Exclusions dialog box displays.
9. Exclude any IP Addresses in the range specified in the previous step that you do not want
assigned to an IP telephone.
a. In the Start Address field under Exclusion Range, enter the first IP Address in the
range you want to exclude.
b. In the End Address field under Exclusion Range, enter the last IP Address in the
range you want to exclude.
c. Click the Add button.
d. Repeat steps a. through c. for each IP Address range that you want to exclude.
Note:
Note: You can add additional exclusion ranges later by right clicking the Address Pool
under the newly created scope and selecting the New Exclusion Range option.
Example:
Suppose the ranges of IP Addresses available for your IP telephone network are:
● 135.254.76.7 to 135.254.76.80
● 135.254.76.90 to 135.254.76.200
● 135.254.76.225 to 135.254.76.230
The Start IP Address and End IP Address you enter in the IP Address Range dialog box
are 135.254.76.7 and 135.254.76.230 respectively.
In the Add Exclusions dialog box, exclude the following ranges:
● 135.254.76.81 to 135.254.76.89
● 135.254.76.201 to 135.254.76.224
Click the Next button after you enter all the exclusions.
The Lease Duration dialog box displays.
10. For all telephones that obtain their IP Addresses from the server, enter 30 days in the
Lease Duration field. This is the duration after which a device’s IP Address expires and
which the device needs to renew.
11. Click the Next button.
The Configure DHCP Options dialog box displays.