SpectraLink s340 User Manual

NetLink e340/h340/i640 Wireless Telephone
and Accessories

NetLink s340 Docking Station
NetLink s640 Docking Station
NetLink Desktop Charger
NetLink Dual Charger
NetLink Quad Charger

User Guide

SpectraLink Radio Protocol (SRP)
Cisco SCCP Protocol
ITU H.323 Protocol
MGCP Protocol
SIP Protocol

Part Number: 72-1004-01

Issue F

SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

Notice

SpectraLink Corporation has prepared this document for use by SpectraLink personnel and customers. The
drawings and specifications contained herein are the property of SpectraLink and shall be neither reproduced in
whole or in part without the prior written approval of SpectraLink, nor be implied to grant any license to make,
use, or sell equipment manufactured in accordance herewith.

SpectraLink reserves the right to make changes in specifications and other information contained in this
document without prior notice, and the reader should in all cases consult SpectraLink to determine whether
any such changes have been made.

The terms and conditions governing the sale of SpectraLink hardware products and the licensing of
SpectraLink software consist solely of those set forth in the written contracts between SpectraLink and its
customers. No representation or other affirmation of fact contained in this document including but not limited
to statements regarding capacity, response-time performance, suitability for use, or performance of products
described herein shall be deemed to be a warranty by SpectraLink for any purpose, or give rise to any liability of
SpectraLink whatsoever.

In no event shall SpectraLink be liable for any incidental, indirect, special, or consequential damages
whatsoever (including but not limited to lost profits) arising out of or related to this document, or the
information contained in it, even if SpectraLink has been advised, knew, or should have known of the
possibility of such damages.

Trademark Information

SpectraLink
The SpectraLink logo
LinkPlus
Link
NetLink
SVP

Are trademarks and registered trademarks of SpectraLink Corporation.

All other trademarks used herein are the property of their respective owners.

SpectraLink Corporation
5755 Central Avenue
Boulder, CO 80301
303 440 5330 or
800 676 5465
www.spectralink.com

Copyright © 1998 to 2006 SpectraLink Corporation. All rights reserved

Information in this document is subject to change without notice and does not represent a commitment on the
part of SpectraLink Corporation. The software described in this document is furnished under a license and/or
copyright and may only be used with the terms of SpectraLink’s software license agreement as found in this
manual or at http://www.spectralink.com/consumer/resources/software_updates.jsp
used only in accordance with the terms of the agreement. No part of this manual, or the software described
herein, may be reproduced or transmitted in any form or by any means, electronic or mechanical, including
photocopying and recording, for any purpose except for the sole intent to operate the product or without the
express written permission of SpectraLink Corporation.

. The software may be

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SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

Table of Contents

The NetLink e340 Wireless Telephone 4
The NetLink h340 Wireless Telephone 5
The NetLink i640 Wireless Telephone 6
Operating Instructions 7

Status Indicators 7
Modes of Operation 8
Basic Operation 9
The Wireless Telephone Headset 10
System Feature Activation 11
Using the Softkeys 12
Setting User Preferences 13
Navigation 14
Lock keys 14
Ring options 14
Phone options 15
System info 15
Extension 16
Push-to-talk (PTT) 16
Push-to-talk operation 16

NetLink e340/h340/i640 Wireless Telephone Accessories 19

The NetLink Docking Station 19
Battery Packs 27
NetLink Desktop Chargers 29
NetLink Dual Chargers 30
NetLink Quad Chargers 32
Important Notes about Chargers and Battery Packs 34

General Care of the Handsets and Chargers 35
Tips For Use 36

PLEASE NOTE: 36

Appendix A: Cisco SCCP Protocol 37

Overview 37
Feature Access 38

Appendix B: ITU H.323 Protocol 40

Overview 40
Feature Access 40

Appendix C: MGCP Protocol 42

Overview 42
Feature Access 42

Appendix D: Mitel Networks 43

Overview 43
Feature Access 45

Safety and Regulatory Information 46

NOTE CONCERNING THE WIRELESS TELEPHONES 49
OPERATIONAL WARNINGS 49
ELECTRO MAGNETIC INTERFERENCE/COMPATIBILITY 50
INTERNATIONAL CERTIFICATIONS: 51
SPECIFIC ABSORPTION RATE (SAR) INFORMATION: 52

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SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

The NetLink e340 Wireless Telephone

(shown actual size)

The NetLink e340 Wireless Telephone supports a broad range of enterprise applications and
is ideally suited for the general office, finance or hospitality environments. This compact
handset offers a rich set of features including a high-resolution graphic display, menu-driven
functions and messaging capability – all within a lightweight ergonomic design. A full set of
accessories is available including headsets, chargers and carrying cases.

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SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

The NetLink h340 Wireless Telephone

(shown actual size)

The NetLink h340 Wireless Telephone is a more durable version of the NetLink e340
Wireless Telephone and is ideally suited for healthcare environments. The handset offers the
same features as the NetLink e340 Wireless Telephone including optional interfacing to
nurse call systems and other applications commonly used in healthcare environments. A full
set of accessories is available including headsets, chargers and carrying cases.

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SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

The NetLink i640 Wireless Telephone

(shown actual size)

The NetLink i640 Wireless Telephone is the industry’s most durable handset for workplace
applications. All features available on the NetLink e340 Wireless Telephone are included.
Push-to-talk functionality is also available for broadcast communication among personnel,
eliminating the need for two-way radios or walkie-talkies. The large earpiece seals out
background noise and provides comfort for frequent or long calls. A full set of accessories is
available including headsets, chargers and carrying cases.

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SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

Operating Instructions

Your NetLink Wireless Telephone is a state of the art
communication device that utilizes radio wave technology to send
and receive voice transmissions. It is designed to operate like the
familiar cell phone. However, the handset utilizes the private
telephone system installed in your facility and will not operate
outside the area reached by this system. Additionally, the features
that are available depend on how the handset has been programmed
by your system administrator.

Status Indicators

1 ▪ ▪ ▪ ▪ ▪ ▪ ▪

◄ ►

▲ ▼

Battery Low

[No Service message]

[Melody]

The following guide is meant to provide general information about
your handset. Contact your system administrator for additional
information on how your handset functions within your telephone
system.

The line indicators are associated with line access keys. In the
preceding diagram, line 1 is active.

A left or right arrow is displayed when the screen can be toggled
either left or right to display more characters as described above.

Up and down arrows are displayed when the menu has additional
options above or below what is shown in the display area.

The battery icon indicates the amount of charge remaining in the
Battery Pack. The level indications are approximations of the
remaining Battery Pack life. They do not indicate equal amounts of
Battery Pack Life. When only one level remains, the Battery Pack
needs to be charged.

The Voicemail icon is activated when a new voice mail message is
received if the feature is supported by the phone emulation. It
appears to the right of the Signal Strength icon.

This message displays and an alarm sounds when the handset is in
standby mode and the Battery Pack is critically low. The handset
cannot be used until the Battery Pack is charged.

If warning tones are not disabled, an alarm will sound and a
descriptive message displays when the handset cannot receive or
place calls. You may be outside of the covered area. Walk back into
the covered area. The in-service tone indicates service is re­established.

The signal strength icon indicates the strength of the signal and can
assist the user in determining if the handset is moving out of range.

The download icon indicates that the handset is downloading code.
This icon only appears while the handset is running the over-the-air
downloader. It appears to the right of the Signal Strength icon in the
same location as the Voicemail icon.

A melody is played after the handset is powered on for the first time
following a completed charge (Charge Complete).

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SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

Modes of Operation

Standby mode

Active mode

Push-to-talk mode

(NetLink i640 Wireless Telephone

The handset uses different amounts of power and bandwidth in
different modes of operation. Bandwidth is provided by access
points located throughout your facility. Bandwidth availability varies
by type of access point. The Battery Pack in your handset provides
about four hours of talk time or 80 hours in the Standby mode (see
below).

If push-to-talk (NetLink i640 Wireless Telephone only) is allowed in
the Admin menu and enabled by the user, standby Battery Pack life
is decreased to about 30 hours.

Conservation of battery life and bandwidth is possible when you
understand the modes and use them appropriately.

In the standby mode the handset is waiting for an incoming call or
for the user to place an outgoing call. The extension number is
shown on the display and there is no dial tone. In this mode, the
handset is conserving battery power and bandwidth.

You may set certain preferences in the user option menu described
later. This menu is accessed from the standby mode.

It is important to return to the standby mode after finishing a call by
pressing the

TEnd CallT key. Unless otherwise directed, the following

instructions for using the handset assume that it is in Standby mode.
To place a call, press the

TStart CallT key. This transitions the handset

to active off-hook mode. There is a dial tone, the handset is in
communication with the PBX, and the display shows information as
it is received from the PBX.

The handset is also in the active mode when you receive a call.

In certain PBX integrations, some features are designed to be
accessed from an active on-hook mode. To go on-hook while still
active, you may be directed to press the

TLineT key or a Release feature

key.

See the Appendices for information about on-hook dialing (cell
phone dialing).

Whenever you are in active mode, whether off-hook or not, the
handset requires the most bandwidth of any mode.

To conserve bandwidth and battery power, when you have
completed a call or are finished accessing active mode menus and
features, press the

TEnd CallT key to exit the active mode and return to

the standby mode.

The push-to-talk mode utilizes a common channel for incoming and
outgoing radio communication. Outgoing communication uses the

only)

same amount of bandwidth as the off-hook mode. Incoming
communication uses about half as much.

Part Number: 72-1004-01-F.doc Page 8

SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

Basic Operation

Turn the handset on

Press and hold the
chirps sound. Release the key. The in-service tone sounds and the
extension number displays. The handset is now in standby mode,
ready to make and receive calls.

Turn the handset off

While in standby mode, press and hold the
chirp sounds and the handset turns off. The handset cannot be
directly turned off during a call. End the call first and then turn the
handset off.

Make a call or

Press the

TStart CallT key and then dial the number.

go off hook

Select a line

If multiple lines are available, your telephone system may require
you to select a line before dialing a number. Press the
the number key of the line you wish to use. You may hear a dial
tone.

Dial a number

Dial calls with the handset exactly as with your desk phone. You
may dial extension numbers, internal numbers, or make external
calls, depending on the setup of your PBX. You may hear a dial
tone, then press the number keys to dial the number.

Answer a call

The handset will ring or vibrate to alert you to an incoming call.
Additionally, a line number on the display may flash, and the display
may show information about the call, such as caller’s name and
extension.

To answer a call, press the
ear and speak with a normal tone of voice.

If you are on a call and hear subdued ringing, a call is coming in on
a second line. The line number on the display may be flashing. To
answer this call, put your first call on hold and press the
then press the line number of the second call.

Headset answer

Hang up

When a headset is plugged into the handset, the

# key may be pressed to answer a call.

or

To hang up, press the
each call.

Unlock Keypad

Lock Keypad

Change speaker volume

Press the

Press

You may increase or decrease the volume of the speaker while in a

Unlk softkey, then #, to unlock the keypad.

FCN, then Select, to activate Lock Keys on the Standby Menu.

call by pressing the corresponding
the left side of the handset.

Change ring volume

You may increase or decrease the ring volume on the NetLink i640
Wireless Telephone by pressing the corresponding
buttons located on the left side of the handset while it is ringing.

Silence while ringing

You may silence a ringing handset by pressing the
This action does not interrupt the call and the caller may leave a
voicemail message.

Backlight

The backlight comes on when any key is pressed or when there is an
incoming call and stays on for ten seconds. It turns off after ten
seconds if another key is not pressed within that period.

TPower On Tkey for about one second, until two

TPower OffT key. One

TLINET key and

TStartT Call key, hold the earpiece to your

LINE key,

Start Call, 0 – 9, *

End Call key. Be sure to do this at the end of

Up and Down buttons located on

Up and Down

End Call button.

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SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

The Wireless Telephone Headset

SpectraLink offers optional headsets for use in noisy environments
or if you need to have your hands free while talking on the handset.

To use the headset, simply plug it into the jack on the bottom of the
handset.

While using a headset, the handset will only ring externally for
NetLink e340/h340 Wireless Telephone models. There is no
internal headset ring for these models.

The NetLink i640 Wireless Telephone does have an internal headset
ring. An incoming call will ring in the earpiece. The handset will also
ring externally.

The headsets offered by SpectraLink are specially designed to work
properly with the NetLink Wireless Telephone. We do not
recommend using other headsets.

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SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

System Feature Activation

View Shortcut menu*

Using the Select button

Using the Shortcut keys

Example:

* See the Appendices for variations when protocols other than SRP are used.

The features that have been programmed in your system may be
viewed and activated through the Shortcut Menu and Softkey
Functions. See the Appendices for variations when protocols other
than SRP are used.

System features that are accessible by the NetLink Wireless
Telephone may be viewed by going off hook (pressing the
key) and then pressing the

MENU key. A feature menu displays in

Start Call

the Main display area. This is the Shortcut Menu.

The Shortcut Menu lists the feature shortcut, if any, and the feature
description. As you scroll through the features by pressing the

Down buttons, the feature abbreviation is highlighted in the

and

Up

softkey function display area. To activate a feature, you may press its
softkey, its shortcut key, or the

Select button while the option is

highlighted.
To use the

press

Select key, press Up or Down to highlight an option, then

Select to activate the feature.

Programmed features may have the number 1-9, *, 0, or # in the
left column of the Shortcut Menu. This designates the shortcut key
that activates that feature. To activate the feature using its shortcut
key, press the shortcut key at any time while in the Shortcut Menu.
The feature will activate whether or not that feature is currently
displayed or highlighted. No shortcut indicates that the feature does
not have a shortcut and this is generally the case with primary level
softkey functions.

If the Transfer feature is programmed to shortcut key 2, the
Shortcut Menu will display

2 Transfer

When the Transfer option is highlighted in the menu,

Xfr will be

highlighted in the softkey function display area.
To activate the Transfer feature, press

2.

You may also press the corresponding softkey.
Alternately, you may scroll to the option and press

Select.

If you are not already scrolling through the Shortcut Menu, simply

MENU + 2 to activate the Transfer feature.

press

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SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

Using the Softkeys

View Softkey functions

Using the Shortcut keys

Example:

Note:

* See the Appendices for variations when protocols other than SRP are used.

The softkeys on your NetLink Wireless Telephone enable you to
quickly activate system features. There are four softkeys and up to
16 features programmed for softkey access. See the Appendices for
variations when protocols other than SRP are used. The display area
directly above each softkey is programmed with a feature
abbreviation to guide your access to the feature. The softkeys are
referred to from left to right as A,B,C,D. In our diagram, the
corresponding display area is labeled Aaaa, Bbbb, Cccc, Dddd.

The softkeys operate with a toggle function. Press the left or right
side of the key to activate the corresponding softkey feature.

The first four primary softkey features are displayed in the softkey
function display area by default. To view all of the features that can
be activated through the softkeys, go off hook (briefly press the

Start Call key) and then press the FCN key. The second set of feature

abbreviations will display in the softkey display area. Each time the

FCN key is pressed, a different set of features is displayed, until all 16

possible features have been displayed. The softkey features display
in the same sequence as they appear on the Shortcut Menu.

Activate any feature while its abbreviation is displayed by pressing
the corresponding softkey.

While scrolling through the softkey functions, a shortcut key may be
pressed to activate its corresponding feature, whether or not that
feature is currently displayed in the softkey function display area.

Because system features vary, your system administrator will explain
them in reference to your telephone system.

Using the previous example for the Transfer function: If the
Transfer function is assigned to softkey A in the second level row,

Xfr will display in the Aaaa softkey display area when the FCN

then
key is pressed. Therefore, while in a call press

FCN + (softkey A) to

transfer the call.
Alternately, you may use the shortcut key by pressing
may also press

MENU + 2 as described in the Shortcut Menu section

FCN + 2. You

above.

PBX systems function differently. If your handset does not conform
to these instructions, contact your system administrator for function
clarification.

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SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

Setting User Preferences

Standby menu item 2nd Level 3rd Level 4th Level
Lock Keys
Language [List per download]
Ring Options Telephone Ring Ring Cadence Off

Ring Tone *Tone 1

Ring Volume+ Bars
Vibrate Cadence *Off

Ring Delay** *No Delay

Auxiliary Ring 1
Auxiliary Ring 2
Phone Options Noise Mode *Normal

Key Tones *Enable Tones

Warning Tones *Enable warnings

Display Contrast Contrast %
Keypad Autolock *Disable

System Info Phone IP Addr
Gateway IP Addr
Firmware Version
Extension
Push-to-talk+ Channel Current Channel: X

Enable/Disable PTT Enabled

Audio Volume Bars
Tone Volume Bars

* Default setting
**shows up when Ring Cadence and Vibrate Cadence are both set to a value other than “Off”
+ These options are available only on the NetLink i640 Wireless Telephone

When the handset is in standby mode (on but not in use), press and
briefly hold

FCN to display the Standby menu which allows you to set

user options. Check with your system administrator for specific
features supported by your handset.

*PBX
Continuous
Short Pulse
Long Pulse

Tone 2
Tone 3
Tone 4
Tone 5

PBX
Continuous
Short Pulse
Long Pulse

5 Second Delay
10 Second Delay

High
Severe

Disable Tones

Disable warnings

5 seconds
10 seconds
20 seconds

1 2 3 4 5 6 7 8
New Channel = ?

*PTT Disabled

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SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

Navigation

Up/Down buttons:

Select button:

OK softkey:

Save softkey:

Bksp softkey:

Cncl softkey:

Up softkey:

Exit softkey:

End Call key:

Lock keys

Ring options

Telephone ring

Ring cadence

Ring tone

Ring volume

(NetLink i640 Wireless Telephone

Vibrate cadence

display previous/next menu item.

selects the menu item or option.

selects the menu item or option.

saves the entry.

backspaces to allow editing of entry.

cancels edit and returns to previous menu level.

returns to previous menu level.

exits the menu (at the top level).

exits to standby state (from any level)

Locks/unlocks the keypad. When enabled, the Keypad Lock
option will lock the keypad immediately. If the keypad is
locked, it may be unlocked by the end user pressing the
softkey and then the # key.

Allows the user to set the ring for three separate functions.

Telephone Ring is used for usual telephony functions. The
Auxiliary Rings may be used to set ringing patterns for OAI

applications.

Allows the user to set a distinctive ring style, volume and
sequence. Select from an audible ring or a vibrate-only ring or a
vibrate ring along with or followed by an audible ring.

The cadence is the rhythm of the ring. It may be set to a pre­programmed ring cadence or it may be set to obtain its cadence
from the PBX. The

PBX option is designed to utilize any

distinctive rings sent by the PBX while allowing the user to set
unique rings for auxiliary applications.

Off: silent

PBX

: PBX determines ring cadence (e.g. the PBX may send

rings that differentiate between internal and external calls.)

Continuous: rings continually until answered

Short Pulse: rings in short bursts

Long Pulse: rings in long bursts

The

Play softkey allows the user to preview the tone before

selecting. If Ring Cadence is turned off, the Ring Tone option
will not appear on the menu. Select from five available tones
(scroll to

Tone 5 option).

The graduated volume bar indicates the levels. This setting may
be overridden by adjusting volume while the handset is ringing.

only)

Select a volume level by pressing the
and then pressing the

OK softkey. If Ring Cadence is turned

Up and Down side buttons

off, the Ring Volume option will not display.

The Vibrate cadence options are the same as for Ring Cadence.

Unlk

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SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

Phone options

Display contrast

Keypad autolock

Ring delay

Auxiliary ring 1
Auxiliary ring 2

Noise mode

Key tones

Warning tones:

Determines how long the vibrate cadence will play before the
audible ring starts. If the Ring Cadence or Vibrate Cadence is
turned off, the Ring Delay option will not appear on the menu.
Select the desired length of Ring Delay:

No delay: the audible ring starts as soon as the handset starts to

vibrate.

5 second delay: the handset vibrates for five seconds before

the audible ring starts.

10 second delay: the handset vibrates for ten seconds before

the audible ring starts.

Designed to be utilized by OAI applications, enabling the user
to set a distinctive ring for these applications. Select the desired
Auxiliary Ring

Provides options that describe the noise level in your
environment. Selecting the correct option will adjust the
handset to account for background noise. Select
most office environments;
noise; or

Severe for extremely noisy conditions. Use of the

High for moderate background

Normal for

non-Normal modes is not recommended unless you are in a
loud environment or you may find it difficult to be heard on
your handset.

Determine if tones play when keys are pressed. Key tones are
enabled by default. Turn key tones on or off.

Play to alert user to various conditions, such as system up or
down, out of range, etc. These tones are enabled by default.
Turn warning tones on or off.

Adjusts the display for different lighting situations. Set contrast
by pressing the
contrast is displayed and then pressing the

Up and Down side buttons until the desired

OK softkey.

Locks the keypad automatically when in standby mode. The
automatic locking function of the keypad may be disabled (the
default) or adjusted for a delay before locking. Select desired
keypad autolock delay:

Disable: the keypad will not lock.

5 seconds: the keypad will lock in five seconds

10 seconds: the keypad will lock in ten seconds

20 seconds: the keypad will lock in 20 seconds

System info

Phone IP address

Gateway IP address or

Server IP address

Firmware version

Part Number: 72-1004-01-F.doc Page 15

Displays the IP address currently assigned to the handset. This
number may not be edited.

Displays the IP address currently assigned to the NetLink
Telephony Gateway (in SRP) or the SVP Server IP (in other
protocols—see appendices).

Displays the software version running the handset.

SpectraLink Corporation NetLink e340/h340/i640 Wireless Telephones and Accessories User Guide

Extension

Displays the extension currently assigned to the handset. This
number is for display purposes only; entering it does not assign the
extension in the host telephone system.

Push-to-talk (PTT)

The NetLink i640 Wireless Telephone incorporates push-to-talk
functionality. PTT may be allowed or disallowed in the Admin
menu. If allowed, the user may enable or disable locally, and may set
the channel, tone volume and audio volume. The menu for push-to­talk does not appear if PTT is disallowed on the Admin menu or if
no channel is enabled on the Admin menu.

Channel

Enable/Disable



The current channel is displayed. The user may enable any PTT
channel that has been allowed in the Admin menu by entering the
corresponding number from the keypad. If PTT has been enabled
in this handset, the default channel is the lowest allowed channel as
set in the Admin menu.

Enable turns on PTT mode. Disable turns off PTT mode. PTT is

disabled by default.

If PTT is allowed in the Admin menu and enabled by the user,
standby Battery Pack life is decreased to about 30 hours.

Audio volume

Tone volume

(Additional options may be present. Contact your system administrator for information.)

Used to adjust volume of PTT audio and tones. The graduated
volume bar indicates the levels. The Audio Volume setting may be
overridden by adjusting volume while the handset is in a push-to­talk call. Select a volume level by pressing the
buttons and then pressing the

OK softkey.

Push-to-talk operation

Overview

Selecting a channel

Call period

The push-to-talk feature allows NetLink i640 Wireless Telephones
to operate in a push-to-talk (PTT) group broadcast mode in
addition to the standard telephone operation.

The NetLink i640 Wireless Telephone supports eight multicast
channels with the current channel saved in memory on the handset.
A PTT call is initiated by pressing the
right side of the handset. All NetLink i640 Wireless Telephones
that are monitoring that channel will hear the transmission.

PTT dialogue is interrupted when you answer a PBX call. When the
PBX call is ended, PTT dialogue resumes if in an active call.

See Setting User Preferences above.

The two-way radio operates on the concept of a push-to-talk
session or call period. The push-to-talk call period begins with the
first transmission and ends when there has been no two-way radio
traffic on the channel for ten seconds.

The PTT mode controls the keypad during a push-to-talk call
period. Therefore it is not possible to use the keypad for any other
function such as accessing the on-hook menus or accessing an OAI
application unless the PTT call is Terminiated (see below).
However, it is possible to easily place a PBX call (see below).

Talk button located on the

Up and Down side

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