Aastra Telecom AastraLink Pro 160 - Manual (Page 275)

How Does Network Addressing Work?
41-001190-02 Rev. 01, Rel. 1.2 6-3
AastraLink FAQs
How Does Network Addressing Work?
The first time an AastraLink Pro 160 starts up, it attempts to use DHCP to obtain
an IP address from a server on the network.
If that fails, the AastraLink Pro 160 then uses ZeroConf to assign itself an IP
address within the range 169.254/16 (excepting the first and last 256 addresses in
this range, which are reserved). The AastraLink Pro 160 uses its MAC address as
a basis, then selects a random IP Address within the valid range. The AastraLink
Pro 160 sends out ARP requests to see if the IP Address is already assigned to
another device on the network. If so, the AastraLink Pro 160 assigns itself another
random IP Address until it finds a free address.
Once the AastraLink Pro 160 is up and running, the administrator can use the Web
UI to assign a static IP address to the device. The next time the AastraLink Pro
160 starts up, it uses the static address you assigned.
If the AastraLink Pro 160 device’s public IP Address changes, the device sends an
email message to notify the administrator.
How Does IP Phone Auto-Configuration Work?
When an Aastra IP phone starts up on your IP phone network, the phone uses
multicast DNS to automatically discover the presence of an AastraLink Pro 160
device on the LAN. Once the AastraLink is discovered, the phone then obtains its
configuration file from the device.
Note: Multicast DNS may not traverse between switched network segments (due
to spanning tree non-convergence) or across subnet routers; therefore, it
may be necessary to connect IP phones to the same Ethernet segment or IP
Subnet as the AastraLink, before they can register to the AastraLink Pro.
If you are registering a new IP phone with the AastraLink, the IP Phone UI
prompts you to specify the user’s first name, last name, and email address. The
AastraLink Pro 160 then automatically assigns the next free extension to the IP
phone.