Voice
Features
The phone fully supports all commonly used PBX features. These are
easily accessed and simple to use. Single keys access redial, transfer,
hold, and conference. Users can set the phone to forward calls unconditionally,
when busy, or on no answer. A headset is supplied with the phone,
but users can use any headset with a single 2½ mm plug, or
an older version that connects in series with the handset. The user presses a single button or key to switch
between the handset, headset, and speaker modes.
Hands Free Operation
The phone has a full
duplex speakerphone that has built in acoustic echo cancellation.
This makes it suitable for occasional use in a cubicle or small
office. The phone can be configured to automatically answer calls in
this mode so that calls are automatically answered by the
speakerphone after one ring. This feature allows users to be reached
without needing to physically pick up the handset or headset. At the
end of the call, the phone can go silent and ready for the next
call.
Conference
The ZIP 4x4 supports conferencing with three to five people. The
conference is easily set up with any combination of inbound and
outbound calls. Individual members can join or leave the conference
at any time. The conference can be put on hold, allowing the other
parties to continue without the host. The host can use a free call
appearance to place or answer another call. The LEDs on the call
appearance buttons show a different color to indicate those calls
involved in the conference.
Dialling
Users can dial by phone number or SIP URL, which can be abbreviated
for example by dialling “sales.” Users can enter a number
prior to seizing a call appearance or picking up the handset. This
allows users to review and edit the number prior to calling. A single
button (with its own LED) is used to mute the phone, regardless
whether the handset, headset, or speaker is in use. The phone remembers
the last 32 numbers called by the phone and the last 32 numbers
that called the phone. These numbers can be quickly accessed and redialled. The phone provides a phone book for storing the contact
information of 100 individuals. Phone book entries can be easily
added, modified, and deleted. Calls can be made with two or three
key presses.
Encryption
The phone can encrypt the voice stream to another ZIP 4x4. Users
can access this function before or during a call. This prevents
the conversation from being heard using a LAN monitoring device.
Data Features
The ZIP 4x4 has a five port managed switch so users can connect
other devices without any additional investment in an external switch.
One switch port is used internally and four ports are available
for external connections. The four external ports are labelled LAN,
P1, P2, and P3. The LAN port is connected as the uplink into the
network and the other ports are used to connect to external devices
such as PCs or laptop computers. The Ethernet ports support auto
MDIX so they can easily be connected to other devices with straight
through or crossover cables. In addition, all ports perform auto
negotiation of link speed and determine whether operation will be
full or half duplex.
Once
a speed is negotiated, all ports are capable of switching Ethernet
traffic at wire speed. The switch is based on hardware, not software
running on the processor. This allows it to forward traffic at line
rates without limitation, thus ensuring that devices downstream
are not starved of bandwidth.
Power over Ethernet
The LAN port on the ZIP 4x4 switch supports the IEEE 802.3af standard
and is capable of receiving power over the Ethernet connection.
This power is sufficient to allow the ZIP 4x4 to perform all of
its functions without the need for an external ac adapter.
The
phone is usually shipped with an ac adapter. Using this reduces
power dissipation in the network room and allows use of the phone
when LAN power is not available. If ac power fails and the LAN can
supply power, operation of the phone is uninterrupted.
VLAN and QoS Support
By default, all ports on the switch are
untagged members of a single VLAN, so the switch can interoperate
with any network. The switch supports the configuration of up to
eight VLANs. Each port can be a member of a tagged VLAN, a member
of an untagged VLAN, or excluded from a VLAN. Full support for IEEE
802.1q VLAN tagging and IEEE 802.1p QoS settings allows the
ZIP 4x4 to provide enhanced quality of service functions at the Ethernet
layer and operate in a modern network.
At
the IP layer the ZIP 4x4 supports the ability to mark the lower
six bits of the IP QoS byte with the various differentiated services
code point (DSCP) markings. This allows for up to 64 code points
to be defined which map to various per-hop behaviors (PHBs). The
ZIP 4x4 internally has eight different priority queues which correspond
to the IEEE 802.1p priority levels and DSCP values. This allows
for the prioritization of voice and signalling traffic over the
best effort data traffic. Each queue is serviced in such a way that
no particular queue is starved.
Cascading of
Phones and Devices
The ZIP 4x4 switch ports P1, P2, and P3 can be used for cascading
additional ZIP 4x4 phones in addition to connecting external devices.
By cascading a few layers of ZIP 4x4 phones, a switching network
can be created at no additional cost that supports multiple users
and devices.
Because
the switch forwards traffic at line rates, and because it fully
supports QoS and VLANs, cascading devices in this fashion provides
the equivalent functionality of multiple switches in a network room.
PCs and other phones cascaded in this way have access to the full
line rate of traffic provided by the network.
LCD
The LCD intelligently shows users all relevant information without
any soft keys being required. It displays all information about
a call, such as the name and number of a caller and its duration.
For incoming calls it displays the intended recipient of the call,
which is useful if the phone is shared. For conference calls, the
phone displays the name of each person on the call and their associated
call appearance.
Preferences
and Settings
There are many parameters on the phone that allow it to operate
in the network. The phone automatically downloads these at power
on from a configuration file that is generated by the system administrator.
On the phone, these settings are protected by a password. The user
can customize personal preferences without preventing the phone
from functioning properly in the network.
Special Functions
These features depend on the IP phone system, but are fully supported
by the ZIP 4x4:
-
Location.
If the phone is connected to a phone system, but physically
remote from it, the phone system must dial a unique number to
access emergency services. The ZIP 4x4 allows a user to select
a location (derived from the phone system) when the phone powers
up.
-
Call
Park and Pickup. When a user parks a call, the phone system
puts the call on hold, and maintains control of the call. The
phone system issues a two digit number to the user. From any
ZIP 4x4, the call can be retrieved (picked up) using this number.
-
Page.
This allows a user to make an announcement through the speaker
on a group of phones. The announcement is made without interaction
on behalf of the recipient. The system administrator provisions
the paging groups. Depending on a user’s rights, the user
can send an announcement to different paging groups.
-
Here
I am. This feature enhances the follow me feature incorporated
into many phone systems. Users indicate they can be contacted
at a specific ZIP 4x4 by quickly entering their name or extension
and PIN. Subsequently, the phone system can forward calls to
that phone and any other phone associated with that user. This
feature is also used by agents to log into an ACD group without
using a PC. The phone system can then route calls to all agents
who are logged in.
Calculator
The phone incorporates a calculator that can represent numbers up
to 12 digits in fixed and scientific notation. A user can easily
put the phone in calculator mode and still use the phone to make
or receive calls. At the end of a call, the phone displays the calculator
exactly as it was prior to the call.
Date
and Time
The phone uses SNTP to automatically obtain the date and time from
the network. However, the date and time can be set manually in the
absence of an SNTP server. The phone displays the date and time,
the start time, and the duration of each call on the LCD.
Technology
The ZIP 4x4 has an internal computer capable of performing 400 MIPS.
This internal computer runs a highly reliable real time embedded
Linux operating system. The phone externally looks and behaves like
a regular business phone, and not like a computer with a handset
attached. The ZIP 4x4 uses SIP for call control. This protocol is now widely
recognized as the standard for IP telephony.
The
ZIP 4x4 performs all of the functions of a user agent client and
a user agent server. It can be used with all standard SIP servers,
making it a truly open IP phone. The phone incorporates comprehensive
self tests and diagnostic capabilities. These allow for rapid isolation
and resolution of problems associated with deployment.
Physical
and Environmental 
Operating
temperature: 10°C to 40°C (50°F to 104°F)
Storage temperature: 0°C to 50°C (32°F to
122°F)
Weight: 0.9 kg (2.0 lb). Shipping weight 2.0
kg (4.4 lb)
Size: 180 mm (W) x 230 mm (D) x 100 mm (H) (7" x 9" x 4")
Safety: UL 60950, CSA-C22.2, EN 60950:2001
EMI: FCC Part 15, ICES-003 class A, CISPR 22, AS/NZS 3548
Class A
EMC: CISPR 24 (EN55024:1998), EN61000-4
Warranty: one year
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