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46 Chapter 3 Installing IP telephones

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Choosing a Jitter Buffer

A jitter buffer is used to prevent the jitter associated with arriving (Rx) voice packets at the IP

telephones. The jitter is caused by packets arriving out of order due to having used different

network paths, and varying arrival rates of consecutive voice packets.The greater the size of the

jitter buffer, the better sounding the received voice appears to be. However, voice latency (delay)

also increases. Latency is very problematic for telephone calls, as it increases the time between

when one user speaks and when the user at the other end hears the voice.

Note: You can only change the jitter buffer on a configured IP telephone if it is online to the

Business Communications Manager, or if Keep DN Alive is enabled for an offline telephone.

Installing i-series telephones

The Nortel Networks i-series telephones (i20XX) can be configured to the network by the end user

or by the administrator. If the end user is configuring the telephone, the administrator must provide

the user with the required parameters.

A maximum of 90 IP telephones, including Nortel Networks i2050 Software Phones, and H.323

devices such as NetVision handsets, can be connected on the Business Communications Manager

system, if the system resources support the deployment.

Before installing

Before installing the i200X telephone, ensure that:

• the telephone has the appropriate power supply for your region

• if powered locally, the installation site has a nearby power outlet;

otherwise, it can be powered through a Power Inline Patch Panel (PiPP)

• the installation site has a 10/100 BaseT Ethernet connection

• if you are using an IP telephone that does not have a 3-port switch, ensure you have 10/100

BaseT Ethernet connections for both the telephone and for your computer equipment.

Using a 3-port switch

In an office environment where a LAN network already exists, most computers will already be

connected to a LAN line. To avoid the necessity of installing duplicate network connections, you

can use a Nortel Networks 3-port switch for older model i2004 telephones. This switch allows the

telephone and computer to connect to the same network connection. For more information, consult

the i2004 setup card and the 3-way switch documentation.

Caution: Do not plug the telephone into an ISDN connection. This can cause severe

damage to the telephone. Plug the telephone only into a 10/100 BaseT Ethernet

connection.

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Avaya IP Telephony Guía de configuración Pagina 46