# Using DHCP and DNS server

You want to use an active DHCP server to address the IP system phones and an active DNS server to find the communication server. The default value intelligate is entered in the configuration of an IP system phone as the communication server's host name.

If the DNS server has an entry under that name and the IP address of the Master or single system is entered there, the IP system phone finds its communication server.

You can make the DNS entry either manually or you can enter intelligate under the communication server host name. The latter variant requires that the dynamic updates function be activated in the DNS server.

Once the DNS server is set up, you can connect the IP system phones.

As soon as an IP system phone has started up, the following sequence begins (simplified):

- The IP system phone sends an address request together with its MAC address and the vendor class identifier.

- The integrated DHCP server responds to the request, creates and registers a new link between the MAC address and an IP address, and sends the IP system phone its address co-ordinates.

- The system phone searches for its communication server under the name intelligate. The DNS server sends the IP system phone the communication server's address co-ordinates.

- The system phone logs on with the communication server. It is now ready for registration.

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