Overview of Voice over IP (VoIP) and Network Protocols
38 4600 Series IP Telephone LAN Administrator Guide
Step 4: Telephone and the Call Server
The call server referred to in this step differs depending on whether the telephone is H.323 or
SIP. For H.323 IP telephones, the call server is the Avaya Media Server. For SIP IP telephones,
the call server is the Registration Server.
In this step, the telephone and the call server exchange a series of messages, which cause the
display on the telephone to prompt the user. For a new installation and for full service, the user
must enter the telephone’s extension and the call server password. For a restart of an existing
installation, this information is already stored on the telephone, but the user may have to
confirm the information. The telephone and the call server exchange more messaging, with the
expected result being that the telephone is appropriately registered.
An exception to the requirement to enter an extension and password is for H.323 IP telephones
running R2.3 and later software. These telephones support a feature called Unnamed
Registration. Unnamed Registration allows a telephone to register with the Avaya Media Server
without an extension, assuming the Avaya Media Server also supports this feature. To invoke
Unnamed Registration, take no action—just let the Extension... prompt display for 60 seconds
without making an entry. The telephone will automatically attempt to register by means of
Unnamed Registration. A telephone registered with Unnamed Registration has the following
characteristics:
● only one call appearance,
● no administrable features,
● can make only outgoing calls, subject to call server Class of Restriction/Class of Service
limitations, and
● can be converted to normal “named” registration by entering a valid extension and
password.
More details about the installation process are available in the 4600 Series IP Telephone
Installation Guide and in Chapter 3:
Requirements of this document.
TCP/UDP Port Utilization
Like most network equipment, the 4600 Series IP Telephones use a variety of protocols,
particularly TCP and UDP, to communicate with other equipment in that network—numerous
different types of servers, routers, other telephones, etc. Part of this communication identifies
which TCP and/or UDP ports each piece of equipment uses to support each protocol and each
task within the protocol.
Depending on your network, you might need to know what ports or ranges are used in the 4600
Series IP Telephones’ operation. Knowing these ports or ranges allows you to appropriately
administer your networking infrastructure. In this case, you will find the following material useful.
