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Overview of Voice over IP (VoIP) and Network Protocols
34 4600 Series IP Telephone LAN Administrator Guide
Software
As shipped from the factory, the 4600 Series IP Telephones may not contain the latest software.
When the telephone is first plugged in, a software download from a TFTP or HTTP server starts
to give the telephone its proper functionality.
For downloads of H.323 software upgrades, the PBX provides the capability for a remote restart
of the 4600 Series IP Telephone. As a consequence of restarting, the telephone automatically
restarts reboot procedures. If new software is available on the server, the telephone downloads
it as part of the reboot process.
A 4602, 4602SW, 4602SW+, 4610SW, 4620SW, and 4621SW IP Telephone can support either
H.323 or SIP software, but not both at the same time. All telephones come from the factory with
H.323 software by default. You can convert a telephone from H.323 to SIP, or from SIP to H.323
by administering your server and settings file. For more information, see “Converting Software
on Avaya 4600 Series IP Telephones” in the 4600 Series IP Telephone Installation Guide
(Document Number 555-233-128).
DHCP and File Servers
The DHCP server provides the following information to the 4600 Series IP Telephone:
● IP address of the 4600 Series IP Telephone
● IP address of the Gatekeeper board on the Avaya Media Server, applicable only to H.323
IP telephones
● IP address of the TFTP server if applicable, otherwise the HTTP server
● The subnet mask
● IP address of the router
● DNS Server IP address
Administer the LAN so each IP telephone can access a DHCP server containing the IP
addresses and subnet mask listed.
The IP telephone cannot function without an IP address. The failure of a DHCP server at boot
time leaves all the affected voice terminals unusable. A user can manually assign an IP address
to an IP telephone. This can cause a problem when the DHCP server finally returns because
the telephone never looks for a DHCP server unless the static IP data is unassigned manually.
In addition, manual entry of IP data is an error-prone process. Avaya therefore strongly
recommends that a DHCP server be available when the IP telephone reboots. If a DHCP
server is not available at remote sites during WAN failures, the IP telephone is not available
after a reboot.