# Server configuration (DHCP server)

With the integrated DHCP server it is easy to register your IP-bound system phones (SIP and IP system phones) to the communication server.

After a first start the DHCP server is switched off and no DHCP address range is defined. You can only switch on the DHCP server if the communication server itself has a static address without DHCP.

Table 1. DHCP server settings
Parameter | Explanation
DHCP server | The internal DHCP server is switched on. Note: The DHCP server can only be switched on if the communication server itself has a static address and is addressed without DHCP. See IP addressing view.
DHCP support | All: All the devices in the subnet requesting an IP address (all DHCP clients) are provided with an IP address from the address range of the DHCP server, and the link is registered. Mitel devices only: Only Mitel DHCP clients such as IP-bound system phones are provided with an IP address and registered.
Vendor options | Using the vendor options the DHCP server can serve IP-bound system phones with specific configuration information. Standard: The DHCP server provides the vendor options stored as standard. Configuration file: The DHCP server provides the vendor options specified in the configuration data. You need to store this configuration file beforehand in the /dhcp/ directory in the communication server’s file management system. No vendor options are provided if the DHCP server cannot find the configuration file.

Table 2. Address range
Parameter | Explanation
Subnet range | Display of the subnet address range within which the DHCP server is located.
Subnet mask | Valid subnet masks for the DHCP server. Subnet mask (same setting as under IP network / LAN).

Table 3. Reserved addresses
Parameter | Explanation
Communication server | IP address of the communication server (same setting as under IP network / IP addressing).
Gateway | Gateway of the subnet mask (same setting as under IP network / IP addressing).
Primary DNS server | IP address of the DNS server (same setting as under IP network / IP addressing).
Secondary DNS server | IP address of the alternative DNS server (same setting as under IP network / IP addressing).

Table 4. DHCP
Parameter | Explanation
First IP address | First address of the address range controlled by the DHCP server.
Last IP address | Last address of the address range controlled by the DHCP server. Note: They can manage approx. 400 (Mitel 470), 50 (Mitel 415/430), 500 (SMB Controller), and 3000 (Virtual Appliance) terminals via the integrated DHCP server. You can more information in the system manual (direct link in the section "See also...").
Lease time | Before the validity period expires, the DHCP clients (e.g. system phones) notify the DHCP server whether they want to maintain their link. Once the validity period has expired, the DHCP server extends the validity of all the links for which it received such requests and resets the timer for the validity period. All links for which no request was received are disconnected and the corresponding IP addresses are released. Note: If you modify the validity period, all non-reserved links are disconnected.

See also System Manual Virtual Appliance, System Manual Mitel 470, System Manual Mitel 415-430, and System Manual Mitel SMBC documents on Document-Center.

Parent topic: DHCP server
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