User guide

MAXCS ACC 6.7.1 Administration Manual 287

C HAPTER

Network Configuration Guidelines

for VoIP

Real-time applications such as voice communications require a networking environment

that meets certain requirements to deliver and maintain good voice quality.

The following network configuration guidelines are highly recommended when using

MAXCS VoIP features.

ISP/Intranet Quality of Service (QoS)

• If you subscribe to the public IP network or use your own Intranet, make sure the

maximum network delay is less than 100 milliseconds.

• Also, the typical packet loss rate should be less than 1 percent.

Virtual LANs

MAXCS supports virtual LANs in accordance with IEEE 802.1Q. A virtual LAN (VLAN) seg-

ments an Ethernet-based network into different logical networks that provide different

services such as data service and voice service. It also defines broadcast domains to re

duce network traffic load. It provides a managed network environment to run voice and

data together smoothly.

The IEEE 802.1Q header includes IEEE 802.1p, a standard method for assigning priority

to packets traversing a network. It works with the Ethernet MAC (Media Acccess Control)

header at the data link layer. The managed switches in a network are responsible for

differentiating packets based on their priorities and processing them in different orders.

Requirements

• MAXCS 6.7 or above with two NICs for 802.1Q VLAN

• MAXCS 6.7 or above for 802.1p

• NIC support 802.1p for 802.1p

• The following IP phone firmware:

• VLAN: 2x65 or above and boot code version 12 or above

• 802.1p: 2x8x (MAXCS 6.7 firmware)

• Layer 2 managed switch