Yealink T48G User manual

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Copyright
Copyright © 2016 Channel Telecom Ltd.
Information in this document is subject to change without any notice. No part of
this document may be reproduced, transmitted or stored in a retrieval system, in
any form or by any means, electronic or mechanical, for any purpose, without the
written permission of Channel Telecom Ltd.

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Contents
1. Introduction ...........................................................................................................5
1.1. Purpose of this Document................................................................... 5
1.2. Related Documents............................................................................ 5
1.3. Yealink Phone On-line Customisation ................................................... 5
2. Getting Started ...................................................................................................... 6
2.1. Equipment Required .......................................................................... 6
2.2. Phone Assembly ................................................................................ 6
2.3. Router ............................................................................................. 7
2.4. Making the Connection....................................................................... 7
2.5. Connection Failure............................................................................. 8
2.6. Phone Lines ...................................................................................... 8
2.7. Log on to the Portal Website ............................................................... 8
3. Know Your Phone..................................................................................................9
3.1. Screen Icons................................................................................... 11
4. Using Your Phone ................................................................................................13
4.1. Phone Operation ............................................................................. 13
Making the connection ........................................................................... 13
Integration with the Nimbus UC Portal ..................................................... 13
Dialling Assistance................................................................................. 13
Redial .................................................................................................. 13
Messages ............................................................................................. 14
Call Forwarding ..................................................................................... 14
Do Not Disturb ...................................................................................... 14
4.2. Phone Functions .............................................................................. 15
Home Screen Options ............................................................................ 15
Call Features......................................................................................... 16
Receiving a Call..................................................................................... 16
Making a Call ........................................................................................ 17
Call Connected Options .......................................................................... 18
Putting a Call on Hold ............................................................................ 18
Receiving a 2nd Call .............................................................................. 19
3-Way Conference Calling....................................................................... 20
Transferring a Call ................................................................................. 20
Missed Calls.......................................................................................... 20
Voice Mail............................................................................................. 21
4.3. Advanced Phone Features................................................................. 22

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Call Waiting .......................................................................................... 22
Line Monitoring ..................................................................................... 22
Call Parking and Retrieval....................................................................... 23
Ringing Group Pickup............................................................................. 24

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1. Introduction
1.1. Purpose of this Document
This guide is to show you how to install and use your Yealink T48G phone which
you will use in conjunction with the Nimbus UC portal www.nimbusuc.com,
therefore the functionality and features described are an appropriate subset of
those available. Full details of the phone’s capabilities can be found in the Yealink
SIP-T48G which can be obtained from the Yealink web site. However, always use
the facilities and features offered by the portal website in configuring your phone
in preference to any local capabilities.
1.2. Related Documents
The Nimbus UC Setup and User Guide provides guidance for the ordinary user on
the facilities and features of your phone system. It should be used in conjunction
with this guide.
The Nimbus UC System Administrator’s Guide provides instruction for the
Company Administrator in setting up the system and configuring the features and
functionality available to each user.
For Gold product Administrators there is an additional Nimbus UC Gold
Subscriber’s Guide for the Auto Attendant, Call Recording and Call Queueing
Capabilities.
These guides can be downloaded from the Support Menu on the portal website or
accessed via the Help menu.
1.3. Yealink Phone On-line Customisation
Certain features of the Yealink phone operation can be customised via a web
browser. These are restricted to setting up the appropriate network connections,
changing the ring tones and security password and, if desired creating a local
phone directory, although this is discouraged as your portal website is the natural
place for personal and company phone directories. All other features and settings
relevant to phone usage are handled by your portal website.
To Access the Yealink web user interface tap the Menu soft key on your phone
followed by selecting the Status option. This will display your phone details. Note
down the IP address and enter that into your web browser. This will bring up the
Yealink web user interface requesting your Username and Password to login. The
default for both is ‘User’. These may be changed via the Security tab.
The Network tab allows you to specify what sort of network connection you wish
to make IP4 or IP6, DHCP or Static IP.

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2. Getting Started
2.1. Equipment Required
Yealink T48G phone and desk stand
Power Supply –either via a power adapter or a PoE (Power over Ethernet)
switch
Ethernet Broadband Router
Operational Ethernet LAN
Ethernet cable to connect telephone to router
Configuration Details sheet giving the following information:
oPhone number
oService Pin
oPortal website logon details
2.2. Phone Assembly
oFind the longer end of the coiled phone cord. Insert it into the side of the
phone base in the slot marked with the Handset icon.
oInsert the short end of the handset cord into the jack at the bottom of the
handset (not shown)
Handset port
Desk Stand Slots
Headset port
Internet port
5V Power port

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oAttach the desk stand by lining up the tabs on the desk stand with the slots
on the back of the phone. Slide the top tabs into the slots and click the
bottom tabs into the lower slots.
oIf you are using an external power source plug the power supply cable into
the power port on the phone base.
NOTE. The Yealink T48G does not ship with a power supply. If you are not
using Power over Ethernet (PoE), you must order a suitable power supply
separately.
oIf you are using Power over Ethernet (PoE) to power the phone, the phone
will receive power when you connect an Ethernet cable from the phone’s
Internet port to a switch in your network that provides PoE.
oIf you are using a headset, plug the RJ11 jack into the port on the underside
of the phone.
2.3. Router
Your router should be set up to perform NAT (Network Address Translation) and
act as a DHCP server (or have a standalone DHCP server somewhere on your
network). These features are normally enabled by default on most routers.
An IP address will be allocated to the phone automatically when you plug the
Ethernet cable from your phone into your router.
It is our strong recommendation to minimise the number of firewall rules required
on the router. This will reduce the CPU load on the router and also future proof the
site from future additions to the service.
This is implemented by two rules which allow all (UDP and TCP) traffic to and from
154.51.129.0 and 217.135.162.0 netmask 255.255.255.0 - this is a /24 network.
You should also disable any Application-level Gateway (ALG) on your router.
The system can support both static and dynamic IP addresses.
2.4. Making the Connection
Plug in the network and power connections. The phone will then perform a boot-up
sequence. During this sequence the Power LED (on the top right of your phone)
will glow red and the phone screen will display ‘Welcome’ followed by ‘Initializing…
Please wait’. Once the phone is initialized the Power LED will go out.
After your phone is successfully connected to the network and receives a basic
configuration, the touch sensitive phone screen will then display the standard
menu for the phone. The time and date in the top right with the last 6 digits of
your primary account number in the top left and at the bottom touch sensitive soft
keys are displayed for particular actions. The touch sensitive soft keys on the left
hand side of the screen display the the last 6 digits of their associated line
numbers. Up to 6 line accounts are permitted.

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You should now hear a dial tone when you pick up the handset, tap a line soft key
or press the loudspeaker button. Try making a call.
2.5. Connection Failure
If at any time you don’t hear a dial tone or the LCD screen displays a message
‘Network is unavailable’ then unplug the power supply to the phone and reboot
your router. When the router has successfully rebooted plug the power back into
the phone.
If there is still no line dial tone on any line or the phone screen fails to display,
then this may because there is a power failure, broadband ADSL fault or
connection device failure. If you are unable to identify a fault then please contact
your provider.
2.6. Phone Lines
The touch sensitive soft keys on the left of the phone are the line buttons. A phone
can have one to six lines associated with it.
For each phone line this allows you to:
make a second call while a call is already in progress (putting the first call
on hold)
receive a second call while a call is already in progress (if Call Waiting is
switched on)
to switch between two different calls
Each line is capable of handling two calls in or out. You can receive a second call
into the phone by putting the current call on hold and you can, in addition, hold a
3-way conversation with both parties. See later sections of this manual.
You may also dial out to a third party while holding an existing call.
2.7. Log on to the Portal Website
Once you’re connection is established open up the Nimbus UC portal
www.nimbusuc.com and log in using the Username (logon ID) and Password
given in the Configuration Details sheet that came with your handset.
You can now set up the particular features and facilities you would like to use on
your phone service. Please see the Nimbus UC Setup and User Guides.
If you experience any problems call Customer Services. The number to call can be
found by hovering over the telephone icon at the top right of the Home page, or
clicking on ‘Talk to Customer Services Now’

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3. Know Your Phone
Diag No
Phone Feature
Description
1
Key pad
Use to dial phone numbers, enter letters and choose
menu items
2
Line Buttons
UnPark Buttons
(when available)
Solid Green –the line is being used
Phone Icon Red –a call is currently parked
3
Touch Sensitive
LCD Screen
Displays date and time, Phone numbers and soft key
options
4
Power LED
Solid Red - the phone is initializing
Fast Flashing red - the phone is ringing
Slow Flashing red - the phone has voice mail
6
3
5
7
4
12
10
8
13
9
11
1
2
14
15

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Diag No
Phone Feature
Description
5
Menu Soft Keys
Press a soft key for the action shown on the label
6
Navigation Pad
Press an arrow key to scroll left, right, up or down
through items shown on the LCD screen
Confirms actions or answers incoming calls
7
Messages Button
Press to access Voice mail
8
Function Buttons
Enables Group Pickup, Call Parking, Call Forwarding
and switch to DSS keys
9
Redial Button
Redials a previously dialed number. Screen displays
a list of previously dialed numbers that were missed,
placed, received or forwarded. Select type by
tapping screen and tap number to call.
10
Mute Button
Press to mute or unmute the phone. When muted
the other party cannot hear you
11
Volume Button
Press + to increase the volume and –to lower the
volume of the Handset/Headset/Speaker (when the
handset is off the phone)
Ringer volume (when the handset is on the phone)
12
Headset Button
Press to turn the headset on or off.
13
Speaker Button
Press to turn the speaker on or off. When the
speaker is on the button glows green
14
Hold Button
Press to put call on hold or to release from hold
15
Transfer Button
Press to transfer call
OK

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3.1. Screen Icons
Network is unavailable
Registered successfully
Register failed
Registering
Hands-free speakerphone mode
Handset mode
Headset mode
Multi-Lingual lower case letter input mode
Multi-Lingual upper case letter input mode
Alphanumeric input mode
Numeric input mode
Multi-Lingual upper and lower case letters input mode
Voice mail
Auto Answer
Do Not Disturb
Call Forward
Call Mute
Ringer Volume is 0
Received Calls
Placed Calls
Missed Calls

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Forwarded Calls
Recording box is full
A call cannot be recorded
Recording starts successfully
Recording cannot be started
Recording cannot be stopped
Bluetooth mode is on
Bluetooth headset is both paired and connected
The default caller photo and contact icon

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4. Using Your Phone
4.1. Phone Operation
You may use the handset, the inbuilt speaker or an approved headset to make and
receive calls.
Making the connection
Picking up the handset, tap a line soft key or pressing the speaker or headphone
button will connect the phone to the first line on your phone. If you wish to use
another line then tap the second or subsequent line soft keys on the left of the
phone screen.
Tapping a line soft key when the handset is on the phone will automatically invoke
the speaker unless the headset is plugged in.
Integration with the Nimbus UC Portal
The phone is integrated with the portal so that you can access your company and
personal address books and use any of the short codes you have specified directly
from the phone.
In addition there are many Service Codes that allow you to enable and disable
many features of the system and to check on their current status. These are all
described in Key Phone Numbers Directory in the Nimbus UC Setup and User
Guide.
The portal website supports Click-2-Talk which enables you to click on any number
displayed on your PC in the Company or Personal address books, Call History or
Voice mail and have it automatically connected to your default phone.
Dialling Assistance
As you start to dial a number the phone’s LCD screen will display a list of phone
numbers from your recent call history list that most closely match the numbers
you have entered so far. Choose the desired number and tap it to dial the number.
Press the speaker button or headset button to use.
Redial
Press the Redial button on your phone and the screen will display a list of
previously dialed numbers that were missed, placed, received or forwarded. Select
type by tapping the screen and then tap a number to call. Press the speaker
button or headset button to use.
Pressing the redial button twice will call the last number previously called.

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Messages
The power LED light flashing red indicates that there is a voice mail message
together with the voice mail icon on the screen. Pressing the Messages button on
the phone will connect you to the phone messaging service.
Call Forwarding
The third soft key on the right of the screen is labelled Forward and this allows you
to divert all calls to another number. This may be set up in two ways:
Via the Nimbus UC Portal
The Nimbus UC portal allows you to set up a Call Divert number which will be
called if you’re on the phone or it isn’t answered. Alternatively, you can have all
calls diverted to the number you specify on the portal for a selected time period. If
you choose this latter option then the telephone screen will display and all
calls made to this phone will be diverted.
To stop calls being diverted simply tap the Forward soft key on the phone, the
icon will disappear and the portal will be updated.
Via the Phone
Tap the Forward soft key and the Feature ‘Always Forward’ will appear on the
screen and tap either the ‘on’ or ‘off’ radio button. You must then enter the
number to which you would like all calls to be diverted. Enter this number and tap
the Save soft key. The telephone screen will display and all calls made to this
phone will be diverted. The Unconditional Call Divert number on the portal website
will be updated with the number you just entered on the phone for the current
time period, the divert will be reset at the end of the time period
To stop calls being diverted simply tap the Forward soft key, the icon will
disappear and the portal website will be updated.
Do Not Disturb
Tapping the DND soft key on the handset will temporarily make your phone
unavailable for receiving calls. Any calls to this phone when DND is set will either
hear the engaged tone or, if any Voice mail feature such as Call Forwarding to
Voice Mail has been activated for this phone number, they will hear a short
message, typically ‘The person on number XXX is unavailable, please leave your
messages after the tone. When you have finished hang up or press the hash key’.

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4.2. Phone Functions
The main functions of the phone are enabled by the four icons at the bottom of the
screen which are known as soft keys and can have varying actions associated with
them depending on the status of the phone at any particular time. The function of
each key is displayed in the screen immediately below the icon.
Home Screen Options
When the phone is inactive the standard soft key action arrangement is:
History MyDir DND Menu
History Stores the last 400 calls made, received, forwarded or missed.
Default screen is all calls and the icon next to the number
indicates which type of call was made. Alternatively, the left
hand side of the screen lists call types: Placed, Received, Missed
or Forwarded calls. Tap the relevant key to display the numbers
of that type. Tap the number to call it. Alternatively tap the
information icon for more details of the call and here you
can edit it, add it to local contacts, add it to local blacklist or to
delete it. You can scroll through the list by tapping the arrows on
the right hand side of the screen.
MyDir The screen will display two dialogue boxes inviting you to enter
the name of the contact you wish to call. The default selection
gives you access to the Company and Personal phone directories
held on the portal website. Tap the relevant number to call it.
The other dialogue box gives access to numbers stored locally on
the phone.
DND Tapping this soft key will prevent any calls being put through to
your phone and is designated . The phone screen will display a
missed call icon together with the number of calls missed and
will log the numbers. Alternatively it will display the voice mail
icon if that facility is activated via the portal website. See
DND options earlier in this document
Menu Selecting this soft key produces a list of options:
Status Details the phone and network connections.
Call Features Lists phone features that can be enabled or
disabled, for full description see below
Dir Same functionality as MyDir soft key above but
users should only access the LDAP portal
website directory.
History Same functionality as History soft key above.
Messages Allows voicemail stored on the portal website to
be accessed for each account number.

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Basic Allows ring tone, screen contrast and wallpaper
to be set and Bluetooth to be activated for
suitable headsets. Time and Date are
automatically set and updated. Advanced
settings are not available on this phone.
Call Features
These are features than can be set or accessed on your phone via the Menu soft
key and Call Features option.
Call Control Most of these functions are disabled as the functionality is
controlled from the portal website. However, Call Forward can
be set which activates the ‘Divert all Calls’ function, see full
description in Section 4.1.
Call Waiting This can be enabled or disabled by tapping the appropriate
radio button. See Section 4.3
Auto Answer You can use Auto Answer to automatically answer an incoming
call on a line. Auto Answer is configurable on a per-line basis.
Auto Answer is only applicable when there is no other call in
progress on the phone.
DSS Keys This displays allocated DSS keys. These must not be
configured on the telephone but only via the portal website
Line Monitoring function. See Section 4.3
Anonymous Treatment of incoming anonymous calls. Do not set locally,
but use the privacy settings on the portal website.
Hotline Not available.
Auto Redial You can enable auto redial to redial the phone number
automatically when the called party is busy. You can also
configure the times settings for auto redial and the time to
wait between redial attempts.
Call Completion Not available.
Receiving a Call
When you receive a call only four soft keys are active:
Answer Forward Silence Reject
Answer Either pick up the handset or press the speaker key to take the
call. Tapping the Answer soft key will invoke the speaker if the
handset is on the phone.
Forward If you wish to forward the incoming call to another phone tap the
Forward soft key. You will then be requested to enter the
number to which you want the call to be transferred. You may
use any short code you’ve attributed to a number on the portal

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website. If using the Directory soft key select the LDAP option
to access the portal website directories.
Silence If you wish the phone to stop ringing but not disconnect the
incoming call, tap the Silence soft key.
Reject If you do not wish to take an incoming call on your phone tap
the Reject soft key. The caller will then either hear the engaged
tone or, if any Voice mail feature such as Call Forwarding to
Voice Mail has been activated for this phone number on the
portal website, they will hear a short message, typically “The
person on number XXX is on the phone, please leave your
messages after the tone. When you have finished hang up or
press the hash key”. The phone screen will display a missed call
icon together with the number of calls missed and will log the
numbers. Alternatively it will display the voice mail icon if
that facility is activated via the portal website. Tapping on the
missed call or voice mail icons brings up access menus.
The Reject command deactivates automatically on the incoming
call terminating.
Making a Call
If you know the number or short code you wish to call, just enter the number
directly. Once you enter a phone number to make a call the soft keys become:
History Directory Keypad Send
Send Once you have entered a number or short code you can
invoke dialling by either picking up the receiver, pressing the
speaker button, headphone button or tapping the Send soft
key at the top right of the screen which will use the speaker if
the handset is on the phone.
History Stores the last 400 calls made, received, forwarded or missed.
Default screen is all calls and the icon next to the number
indicates which type of call was made. Select the appropriate
number by tapping on it.
Directory User offered a selection of directories but should only access
the LDAP portal website directory. The screen will display two
dialogue boxes inviting you to enter the name of the contact
you wish to call. The default selection gives you access to the
Company and Personal phone directories held on the portal
website. Tap the relevant number to call it. The other dialogue
box gives access to numbers stored locally on the phone.
Keypad Default screen for entering number manually. As you start to
dial a number the phone’s LCD screen will display a list of

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phone numbers from your recent call history list that most
closely match the numbers you have entered so far. Choose
the desired number and tap it to dial the number. Press the
speaker button or headset button to use.
Call Connected Options
When the call is connected the soft key arrangement changes to:
Transfer Hold Conference End Call
Transfer Gives you the options to transfer to an entered number via
the key pad. The current call will be placed on hold while
the screen will change to ‘Making a Call’ mode described
above. Select the number you wish to transfer to and tap
the Transfer soft key.
Hold If you wish to put a current call on hold then tap the Hold
soft key. This keeps the other party on the line (hearing
either silence or Music on Hold if that has been configured)
but communication is suspended until you tap the Resume
soft key.
Conference will change to ‘Making a Call’ mode described above. Select
the number you wish to transfer to and tap the Transfer
soft key.
When the person answers you can have a private
conversation with them as they first person is still on hold.
Finally tap the Conf soft key once more and all 3 of you will
be connected.
You can control who to speak to by using the Split and
Hold soft keys.
End Call Terminates the call.
Putting a Call on Hold
Tapping hold makes the soft keys:
Transfer Resume New Call End Call
Transfer Gives you the options to transfer to an entered number via
the key pad. The current call will be placed on hold while
the screen will change to ‘Making a Call’ mode described
above. Select the number you wish to transfer to and tap
the Transfer soft key.
Resume Resumes a call on hold.

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New Call If you wish to make another call while putting the current
call on hold, tap the New Call soft key and the screen will
change to ‘Making a Call’ mode described above. Select the
number you wish to connect to and you may then have a 3-
way conversation with both calling or called parties.
End Call Terminates the call.
Receiving a 2nd Call
If a 2nd party calls you while you are speaking to the 1st party the screen shows
‘Incoming call’ and displays the details of the caller. This makes the soft keys:
Answer Forward Silence Reject
Answer Tapping the Answer soft key puts the 1st party on hold and
allows you to speak to the incoming call. The screen will change
the soft keys to the Call Connect options of Transfer, Hold,
Conference and End Call described above.
Forward If you wish to forward the incoming call to another phone tap the
Forward soft key. You will then be requested to enter the
number to which you want the call to be transferred. You may
use any short code you’ve attributed to a number on the portal
website. If using the Directory soft key select the LDAP option
to access the portal website directories.
Silence No effect
Reject If you do not wish to take an incoming call on your phone tap
the Reject soft key. The caller will then either hear the engaged
tone or, if any Voice mail feature such as Call Forwarding to
Voice Mail has been activated for this phone number on the
portal website, they will hear a short message, typically “The
person on number XXX is on the phone, please leave your
messages after the tone. When you have finished hang up or tap
the hash key”. The phone screen will display a missed call icon
together with the number of calls missed and will log the
numbers. Alternatively it will display the voice mail icon if
that facility is activated via the portal website.
The Reject command deactivates automatically on the incoming call
terminating.

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3-Way Conference Calling
To share a call between 3 parties you make use of the conference facility on your
phone. Call the first person you wish to speak to and when they answer tap the
Hold soft key on your phone. This places the first call on hold. Then select the
New Call soft key and select the contact from the LDAP directory or dial the
number or short code of the second person you wish to hold a joint call with. When
they answer you can have a private conversation with them as they first person is
still on hold. Finally tap the Conference soft key once more and all 3 of you will
be connected.
You can control who to speak to by using the following soft keys:
Split Hold End Call
Split Splits the conference call into two individual calls on hold, you
can switch between the calls by tapping the relevant party
displayed on the screen. You can manage each party, either
muting them or removing them from the conference call by
tapping on the appropriate icon next to their details
Hold Places the conference call on hold, neither party can hear you
Transferring a Call
To transfer a call either press the Transfer button or the Transfer soft key
when presented on the phone screen. This gives you the options to transfer the
incoming call to another number. The current call will be placed on hold. Select the
contact from the LDAP directory or dial the number or short code of the person
you wish to transfer the call to. When they answer you can have a private
conversation with them as they first person is still on hold.
Once the number rings you may hang up for an unattended transfer or hang on
until the called party answers for an attended transfer. In this instance the caller
being transferred is kept on hold and unable to hear you until you do the final
transfer by tapping the Transfer soft key once more.
Missed Calls
If you wish to check for missed calls on your phone then select the History soft
key on the home menu, this stores the last 400 calls made, received, forwarded or
missed. Default screen is All Calls and the icon next to the number indicates which
type of call was made. On the left hand side of the screen select Missed Calls. Tap
the relevant key to display the numbers of that type. Tap the number to call it.
Alternatively tap the information icon for more details of the call and here you
can edit it, add it to local contacts, add it to local blacklist or to delete it. You can
scroll through the list by tapping the arrows on the right hand side of the screen.