Wan Considerations; Initialization Process; Step 1: Telephone To Network; Step 2: Dhcp Server To Telephone - Avaya 4600 Series Administrator's Manual

Overview of Voice over IP (VoIP) and Network Protocols

WAN Considerations

QoS is harder on a WAN than a LAN. A LAN assumes no bandwidth concerns. A WAN
assumes a finite amount of bandwidth. Therefore, QoS considerations are more significant
when the IP telephony environment includes a WAN. In addition, there are administrative and
hardware compatibility issues unique to WANs. WAN administration is beyond the scope of this
document.

Initialization Process

These steps offer a high-level description of the information exchanged when the telephone
initializes and registers. This description assumes that all equipment is properly administered
ahead of time. This description can help you understand how the 4600 Series IP Telephones
relate to the routers and servers in your network.

Step 1: Telephone to Network

The telephone is appropriately installed and powered. After a short initialization process, the
telephone identifies the LAN speed and sends a message out into the network, identifying itself
and requesting further information. A router on the network receives this message and relays it
to the appropriate DHCP server.

Step 2: DHCP Server to Telephone

The DHCP file server provides information to the telephone, as described in
Servers on page 52. Among other data passed to the telephone is the IP Address of the TFTP
or HTTP server, which is crucial for the next step.

Step 3: Telephone and File Server

Beginning with Release 2.2, 4600 Series IP Telephones can download script files, application
files, and settings files from either a TFTP, HTTP, or HTTPS server. The HTTPS server applies
only if the server supports Transport Layer Security (TLS) encryption. If you have a mixture of
Release 2.2 and pre-Release 2.2 telephones, you can use either:
TFTP servers only.
●
Both TFTP and HTTP servers, with TFTP running phones with older releases and HTTP
●
for telephones running Release 2.2 and later software.
32 4600 Series IP Telephone Release 2.3 LAN Administrator Guide
DHCP and File