Sip; Registration And Authentication; Wan Considerations; Initialization Process - Avaya 4600 Series Administrator's Manual

Overview of Voice over IP (VoIP) and Network Protocols

SIP

Registration and Authentication

A 4600 Series SIP IP Telephone requires an off-PBX station (OPS) extension on the Avaya
Communication Manager and a login and password on the Registration Server to register and
authenticate it. Registration is described in the Initialization process, in
the Call Server
Release 3.0 Installation and Administration Guide (555-245-705), available on the Avaya
support Web site, http://www.avaya.com/support.

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. If applicable to your network and telephone model, 802.1X
Supplicant authentication occurs at this time, where an 802.1X ID and password have to be
submitted to proceed. Then the telephone sends a DHCP message out into the network,
identifying itself and requesting further information. Depending on your network structure, the
message goes directly to the DHCP server or a network router receives the message and relays
it to the appropriate DHCP server.
36 4600 Series IP Telephone LAN Administrator Guide
on page 38. For further information, see the Converged Communication Server
Step 4: Telephone and