H.323 Standard; Dhcp; Tftp; Dns - Avaya 4600 Series Administrator's Manual

H.323 Standard

Internal signaling provides connection control and call progress (status) information. The H.323 standard
is used for internal signaling for IP packet voice networks. H.323 defines more than simply voice. It
defines a complete multimedia network (voice, video, data), with everything from devices to protocols.
The H.245 standard links all the entities within H.323 by negotiating facilities among participants and
H.323 network elements.
The H.323 standard makes G.711 PCM compression the default form of compression. All other
compression formats are optional.

DHCP

Dynamic Host Configuration Protocol (DHCP) allows a server to assign IP addresses and other
parameters to devices such as the 4600 Series IP Telephones on an as-needed basis. This eliminates the
need to configure each end station with a static IP address. The DHCP application also passes
information to the 4600 Series IP Telephone, identifying the IP Addresses of the PBX and the TFTP
server, and the paths to the upgrade script and the application file on the TFTP server. For further
information, refer to

TFTP

The Avaya 4600 IP Telephones get useful application information from the TFTP server. The telephones
also upgrade themselves using files stored on the TFTP server. While the Avaya 4600 Series IP
Telephones can operate without a TFTP server once software has been downloaded, some functionality
can be lost if the TFTP server is not available when they are reset. For further information, refer to
and TFTP Servers

DNS

The Domain Name System (DNS) is a distributed Internet directory service. DNS is used mostly to
translate between domain names and IP Addresses. Release1.5 and later Avaya IP Telephones can use
DNS to resolve names into IP Addresses. In DHCP and TFTP files, DNS names can be used wherever IP
addresses were available as long as a valid DNS server is identified first (see
69).

NAT

A Network Address Translation (NAT) is an application that can be administered between your network
and the Internet. The NAT translates network layer IP addresses so your local intranet IP addresses can
duplicate global, Internet addresses. A detailed discussion of NAT is beyond the scope of this document,
but it should be noted that use of NAT can lead to problems affecting the consistency of addressing
throughout your network. In Release 1.6 and earlier releases of the 4600 Series IP Telephones, NAT is
not recommended for networks handling IP-based telephony traffic. As of Release 1.7, all 4600 Series IP
Telephones support NAT interworking; hence, there are no problems with NAT and Release 1.7 of the
4600 Series IP Telephones. Note, however, that support for NAT does not imply support for Network
Address Port Translation (NAPT). Specifically, the 4600 Series IP Telephones do not support
communication to the PBX through any NAPT device.
4600 Series IP Telephone Release 2.1 LAN Administrator's Guide
July 2004
DHCP and TFTP Servers
on page 30 and TFTP on page 52.
Overview of Voice over IP (VoIP)
on page 30 and DHCP on page 41.
Overview of Voice over IP
DHCP
DNS Addressing on page
21