How to connect voice terminals to S series switch functioning as a DHCP server

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For details on how to connect voice terminals to an S series switch (except S1700 switches) that functions as a DHCP server, see the section "Example for Configuring a DHCP Server on the Switch to Provide VoIP Access" in Typical IP Voice&IPTV&VOD Configuration of Typical Configuration Examples.

Other related questions:
DHCP functions of S series switches
DHCP dynamically configures and uniformly manages network parameters of hosts on a TCP/IP network. DHCP provides the following functions: - Dynamic allocation: DHCP allocates an IP address with a limited validity period (called lease) to a client. This mechanism applies to hosts that temporarily connect to a network with fewer IP addresses than the total number of hosts and hosts do not need to permanently connect to the network. For example, this mechanism can be used to allocate IP addresses to laptops used by employees on business trips or mobile terminals in cafes. - Static allocation: Fixed IP addresses are assigned to specified hosts. This mechanism applies to hosts with special IP address requirements. For example, the file server of an enterprise needs to use a fixed IP address to provide services for extranet users. Compared with manual IP address configuration, DHCP static allocation prevents manual configuration errors and helps network administrators perform unified maintenance and management. DHCP can allocate other network parameters except for the IP address to hosts, including the DNS server address, routing information, and gateway address.

Do S series switches support the DHCP server polling function on a DHCP relay agent
When functioning as a DHCP relay agent, the S series switch excluding the S1700 supports the DHCP server polling function on a DHCP relay agent starting from V100R006C00. By default, the DHCP server polling function on a DHCP relay agent is disabled. You can enable the DHCP server polling function on a DHCP relay agent by configuring ip relay address cycle in the system view.

Can terminals connected to S series switches obtain IP addresses through DHCP
For S series switches excluding the S1700, terminals connected to switches (enabled to obtain IP addresses through DHCP) can obtain IP addresses through DHCP when either of the following conditions is met: - The switch is configured with the DHCP server function. (By default, a switch is not configured with the DHCP server function.) - Another DHCP server is deployed on the network and there is a reachable route from the terminal to the DHCP server.

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