User's Manual

Parameter Possible values
Packetization Delay No data or an integer number of milliseconds. The number
reflects the amount of delay in received audio packets, and
includes any potential delay associated with the codec.
One-way Network Delay No data or an integer number of milliseconds. The number is
half the value RTCP or SRTCP computes for the round-trip
delay.
Network Jitter
Compensation Delay
No data or an integer number of milliseconds reporting the
average delay that is introduced by the jitter buffer of the
phone.
The implication for LAN administration depends on the values returned by the phone user
reports and topology, loading, and QoS administration for the LAN. This information gives the
administrator an idea of how network conditions affect the audio quality of the current call.
Avaya assumes you have more detailed tools available for LAN troubleshooting.
IP address list and station number portability
You can specify IP address lists on the Avaya B189 Conference IP phones. On startup or on
restart, the phone attempts to establish communication with these various network elements
in turn. The phone starts with the first address on the respective list. If the call server denies
communication with the phone or the session times out, the phone continues to the next
address on the appropriate list and tries that IP address. The phone does not report failure
unless all addresses on a specified list fail, improving the reliability of IP telephony.
The address list and station portability capability also make station number portability possible.
Assume a situation where the company has multiple locations in London and New York, that
share a corporate IP network. Users want to take the phones from the London office to New
York office. When the user starts the phones in the new location, the local DHCP server usually
routes the user to the local call server. The local DHCP server if configured correctly, registers
the user with call server IP address in London.
For details on administration of DHCP servers for lists of alternate call servers, router/
gateways, and HTTP/HTTPS servers, see
Server Administration on page 39.
For more information on DNS addressing, see DNS Addressing on page 64.
TCP/UDP Port utilization
Avaya B189 Conference phones use many protocols, particularly TCP (Transmission Control
Protocol), UDP (User Datagram Protocol), and TLS (Transport Layer Security) to communicate
with other equipment in the network. Part of this communication identifies which TCP or UDP
port each piece of equipment uses to support each protocol and each task within the protocol.
Network Requirements
32 Administering Avaya B189 Conference IP Phone December 2013
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