Snom M55 User manual

M55
SIP DECT Handset
User Manual
illustration scale 100%
Jinwook Hwang | 10. Mar. 2021 | Revision 7.1AW / SNOM M55 HS

2
User Manual
M55
SIP DECT Handset
Table of Contents
Copyright, Trademarks, Legal
Disclaimers ��������������������������������������� 4
Important Safety Information �������������� 5
Important safety instructions�����������������5
For cUL compliance only���������������������� 8
Mesures de sécurité importantes �������� 8
Mesures de sécurité importantes�����������8
Compliance����������������������������������������11
FCC part 15 ������������������������������������������11
FCC Part 68������������������������������������������11
Industry Canada�����������������������������������12
Introduction���������������������������������������13
About this manual ��������������������������������13
Product overview���������������������������������14
Quick Reference Guide �����������������������15
Cordless handset external features �����15
Factory Default Programmable Feature
Key (PFK) Settings ����������������������������16
Handset Installation���������������������������17
Installing the charger���������������������������18
Battery installation and charging ���������19
Wall mounting the charger �������������������22
Adding a corded headset����������������������23
Handset Registration �������������������������24
Auto-registering the handset to the base
station��������������������������������������������������24
Registering by entering the handset’s
IPEI on the Web UI�������������������������������� 25
Manually registering via the LINK key on
base station ����������������������������������������� 26
Manually registering via the Web UI �����27
Deregistering the handset�������������������� 28
Screen icons ��������������������������������������29
Using the Handset������������������������������32
Idle screen �������������������������������������������32
Main Menu �������������������������������������������32
Making calls����������������������������������������� 33
Answering calls������������������������������������ 35
Answering multiple incoming calls�������36
Ending a call�����������������������������������������36
Volume�������������������������������������������������36
Mute�����������������������������������������������������36
Speakerphone�������������������������������������� 36
Corded Headset �����������������������������������36
Bluetooth headset�������������������������������� 37
Call Waiting������������������������������������������37
Missed Calls�����������������������������������������37
Putting a call on hold���������������������������� 38
Putting a call on private hold����������������38
Switching between two calls���������������� 39
Paging a group of handsets/desksets ��40
Receiving a page ����������������������������������40
About Shared Calls������������������������������� 41
Displaying calls on the Call List������������44
Barging In ��������������������������������������������45
Call Privacy������������������������������������������ 45
Using Shared Call Emulation���������������� 46
Transferring a call��������������������������������49
Setting up a conference call�����������������50
Putting a conference call on hold ���������51
Listening to messages �������������������������52

3
Using the Directory ������������������������������53
Using the Call History���������������������������55
Locking the keypad ������������������������������56
Connecting a Bluetooth Headset���������57
Opening the Bluetooth menu����������������57
Adding a Bluetooth headset to the Device
list�������������������������������������������������������� 57
Using the Device list�����������������������������58
Configuring the Handset���������������������60
Setting call waiting ������������������������������60
Viewing handset status ������������������������60
Setting the language����������������������������61
Setting the display options�������������������62
Setting the keypad light ����������������������� 62
Setting Silent Mode������������������������������63
Setting the ringer tone and volume ������ 63
Setting the advisory tones�������������������� 64
Setting Auto ans audio �������������������������64
Setting Speed Dial entries��������������������65
Setting lift handset to answer���������������66
Setting the missed call alert�����������������66
Registering or deregistering your deskset
�������������������������������������������������������������66
WebUI �����������������������������������������������67
Using the WebUI�����������������������������������67
How to identify the IP address of the base
station��������������������������������������������������67
Accessing the WebUI����������������������������69
System Status ��������������������������������������70
Cordless Registrations������������������������� 71
Cordless Status������������������������������������ 71
Base Status ������������������������������������������ 72
Base Preferences��������������������������������� 72
User Preferences ���������������������������������72
Base Directory ������������������������������������� 73
Blocked List �����������������������������������������76
Remote XML�����������������������������������������76
Security ����������������������������������������������� 77
Troubleshooting���������������������������������78
General issues �������������������������������������78
Technical Specifications���������������������79
Special characters �����������������������������80
Entering special characters������������������80
Maintenance ��������������������������������������81
Taking care of your telephone �������������� 81

4
Copyright, Trademarks, Legal Disclaimers
Copyright © 2023 Snom Technology GmbH
All Rights Reserved�
Snom, the names of Snom products, and Snom logos are trademarks owned by Snom
Technology GmbH� All other product names and names of enterprises are the property
of their respective owners�
Product specifications are subject to change without notice�
Snom Technology GmbH reserves the right to revise and change this document at any
time, without being obliged to announce such revisions or changes beforehand or after
the fact�
Texts, images, and illustrations and their arrangement in this document are subject to
the protection of copyrights and other legal rights worldwide� Their use, reproduction,
and transmittal to third parties without express written permission may result in legal
proceedings in the criminal courts as well as civil courts�
When this document is made available on Snom’s web page, Snom Technology GmbH
gives its permission to download and print copies of its content for the intended
purpose of using it as a manual� No parts of this document may be altered, modified
or used for commercial purposes without the express written consent of Snom
Technology GmbH�
Although due care has been taken in the compilation and presentation of the
information in this document, the data upon which it is based may have changed in the
meantime� Snom therefore disclaims all warranties and liability for the accurateness,
completeness, and currentness of the information published, except in the case of
intention or gross negligence on the part of Snom or where liability arises due to
binding legal provisions�

5
Important Safety Information
This symbol is to alert you to important operating or servicing instructions
that may appear on the product or in this user’s manual� Always follow
basic safety precautions when using this product to reduce the risk of
injury, fire, or electric shock�
Important safety instructions
When using your telephone equipment, basic safety precautions should always be
followed to reduce the risk of fire, electric shock and injury, including the following:
1� This product should be installed by a qualified technician�
2� This product should only be connected to the host equipment and never directly
to the network such as Public Switch Telephone Network (PSTN) or Plain Old
Telephone Services (POTS)�
3� Read and understand all instructions�
4� Follow all warnings and instructions marked on the product�
5� Unplug this product from the wall outlet before cleaning� Do not use liquid or
aerosol cleaners� Use a damp cloth for cleaning�
6� Do not use this product near water such as near a bath tub, wash bowl, kitchen
sink, laundry tub or swimming pool, or in a wet basement or shower�
7� Do not place this product on an unstable table, shelf, stand or other unstable
surfaces�
8� Slots and openings in the back or bottom of the handset are provided for
ventilation� To protect them from overheating, these openings must not be
blocked by placing the product on a soft surface such as a bed, sofa or rug� This
product should never be placed near or over a radiator or heat register� This
product should not be placed in any area where proper ventilation is not provided�
9� This product should be operated only from the type of power source indicated
on the marking label� If you are not sure of the type of power supplied at the
premises, consult your dealer or local power company�
10� Do not allow anything to rest on the power cord� Do not install this product where
the cord may be walked on�
11� Never push objects of any kind into this product through the slots in the handset
because they may touch dangerous voltage points or create a short circuit� Never
spill liquid of any kind on the product�
12� To reduce the risk of electric shock, do not disassemble this product, but take it
to an authorized service facility� Opening or removing parts of the base station or
handset other than specified access doors may expose you to dangerous voltages
or other risks� Incorrect reassembling can cause electric shock when the product
is subsequently used�
13� Do not overload wall outlets and extension cords�

6
14� Unplug this product from the wall outlet and refer servicing to an authorized
service facility under the following conditions:
A� When the power supply cord or plug is damaged or frayed�
B� If liquid has been spilled onto the product�
C� If the product has been exposed to rain or water�
D� If the product does not operate normally by following the operating
instructions� Adjust only those controls that are covered by the
operation instructions� Improper adjustment of other controls may
result in damage and often requires extensive work by an authorized
technician to restore the product to normal operation�
E� If the product has been dropped and the telephone base and/or
handset has been damaged�
F� If the product exhibits a distinct change in performance�
15� Avoid using a telephone (other than cordless) during an electrical storm� There is
a remote risk of electric shock from lightning�
16� Do not use the telephone to report a gas leak in the vicinity of the leak� Under
certain circumstances, a spark may be created when the adapter is plugged into
the power outlet, or when the handset is replaced in its cradle� This is a common
event associated with the closing of any electrical circuit� The user should not
plug the phone into a power outlet, and should not put a charged handset into
the cradle, if the phone is located in an environment containing concentrations
of flammable or flame-supporting gases, unless there is adequate ventilation� A
spark in such an environment could create a fire or explosion� Such environments
might include: medical use of oxygen without adequate ventilation; industrial
gases (cleaning solvents; gasoline vapors; etc�); a leak of natural gas; etc�
17� Only put the handset of your telephone next to your ear when it is in normal talk
mode�
18� The power adapters are intended to be correctly oriented in a vertical or floor
mount position� The prongs are not designed to hold the plug in place if it is
plugged into a ceiling, under-the-table or cabinet outlet�
19� Use only the power cord indicated in this manual�
20� For pluggable equipment, the socket-outlet shall be installed near the equipment
and shall be easily accessible�
21� In wall mounting position, make sure to mount the telephone base on the wall
by aligning the eyelets with the mounting studs of the wall plate� Then slide the
telephone base down on both mounting studs until it locks into place� Mount
the device only at heights not exceeding 2 meters� Refer to the full installation
instructions in “Handset Installation” on page 17-21 in this User Manual�
22� CAUTION: Keep small metallic objects such as pins and staples away from the
handset receiver�
23� WARNING: The product included (ITE) in this manual is to be connected only to
PoE networks without routing to the outside plant�
SAVE THESE INSTRUCTIONS

7
Power requirements Handset charger power adapter:
5�0Vdc 2A (Model number: NBS10B050200VUU)
Handset battery: 3�7V 1500mAh, Li-ion battery
(Model number: 503860AR1500, Manufacturer: Yiyang
Corun Battery Co�, Ltd�)
CAUTION
• The battery cannot be subjected to high or low extreme temperatures during
use, storage or transportation�
• The battery cannot be subjected to low air pressure at high altitude during
use, storage or transportation�
• The battery in the product is replaceable� There is a danger of explosion if the
battery is incorrectly replaced�
• Replacement of a battery with an incorrect type can result in an explosion or
the leakage of flammable liquid or gas�
• Avoid disposal of a battery into fire or a hot oven, or mechanically crushing or
cutting of a battery, that can result in an explosion�
• Avoid leaving a battery in an extremely high temperature surrounding
environment that can result in an explosion or the leakage of flammable liquid
or gas�
• A battery subjected to extremely low air pressure may result in an explosion
or the leakage of flammable liquid or gas�

8
For cUL compliance only
Mesures de sécurité importantes
Ce symbole vous alertera d’informations importantes ou d’instructions
d’entretien pouvant apparaître dans ce guide d’utilisation� Respectez
toujours les mesures de sécurité et de sécurité de base lorsque vous
utilisez ce produit, afin de réduire les risques de blessures, d’incendie, ou
d’électrocution�
Mesures de sécurité importantes
Afin de réduire les risques d’incendie, de blessures corporelles ou d’électrocution,
suivez toujours ces mesures préventives de base lorsque vous utilisez votre téléphone
1� Cet appareil doit être installé par un technicien qualifié�
2� Cet appareil doit être branché à un équipement hôte et jamais branché à un
réseau, tel qu’un réseau PSTN publique ou un réseau téléphonique standard
(POTS)�
3� Lisez et comprenez bien toutes les instructions�
4� Observez toutes les instructions et mises en garde inscrites sur l’appareil�
5� Débranchez ce téléphone de la prise murale avant de le nettoyer� N’utilisez pas
de nettoyeurs liquides ni en aérosol� N’utilisez qu’un chiffon doux et légèrement
humecté�
6� N’utilisez pas ce produit près de l’eau, tel que près d’un bain, d’un lavabo, d’un
évier de cuisine, d’un bac de lavage ou d’une piscine, ou dans un sous-sol humide
ou sous la douche�
7� Ne déposez pas ce téléphone sur un chariot, support ou table chancelants�
L’appareil pourrait tomber et être sérieusement endommagé�
8� Le boîtier de l’appareil est doté de fentes et d’ouvertures d’aération situées à
l’arrière ou en dessous� Afin d’empêcher la surchauffe, ces ouvertures ne doivent
pas être obstruées en plaçant l’appareil sur un lit, divan, tapis ou autre surface
similaires� Ne placez pas cet appareil à proximité d’un élément de chauffage ni
d’une plinthe électrique� De plus, ne l’installez pas dans une unité murale ou un
cabinet fermé qui ne possède pas d’aération adéquate�
9� Ne faites fonctionner cet appareil qu’avec le type d’alimentation indiqué sur les
étiquettes de l’appareil� Si vous ne connaissez pas le voltage de votre maison,
consultez votre marchand ou votre fournisseur d’électricité�
10� Ne déposez rien sur le cordon d’alimentation� Installez cet appareil dans un
endroit sécuritaire, là où personne ne pourra trébucher sur la ligne d’alimentation
ni le cordon téléphonique modulaire�
11� N’insérez jamais d’objets à travers les fentes et ouvertures de cet appareil, car
ils pourraient toucher à des points de tension dangereux ou court-circuiter des
pièces, ce qui constituerait un risque d’incendie ou d’électrocution� N’échappez
pas de liquides dans l’appareil�
12� Afin de réduire les risques d’électrocution, ne démontez pas l’appareil, mais
apportez-le plutôt à un centre de service qualifié s’il doit être réparé� En enlevant

9
le couvercle, vous vous exposez à des tensions dangereuses ou autres dangers
similaires� Un remontage inadéquat peut être à l’origine d’une électrocution lors
d’une utilisation ultérieure de l’appareil�
13� Ne surchargez pas les prises de courant ni les rallonges électriques, car ceci peut
constituer un risque d’incendie ou d’électrocution�
14� Débranchez cet appareil de la prise de courant et communiquez avec le
département de service à la clientèle de Snom dans les cas suivants:
A� Lorsque le cordon d’alimentation est endommagé ou écorché�
B� Si du liquide a été échappé dans l’appareil�
C� Si l’appareil a été exposé à une source d’humidité telle que la pluie ou l’eau�
D� Si l’appareil ne fonctionne pas normalement en suivant les directives du
guide� N’ajustez que les commandes couvertes dans le guide d’utilisation,
car un mauvais réglage de celles-ci peut être à l’origine de dommages, ce qui
nécessiterait des réparations considérables pour remettre l’appareil à son
état de fonctionnement normal�
E� Si l’appareil a été échappé ou son boîtier, endommagé�
F� Si le produit affiche une nette diminution de sa performance�
15� Évitez d’utiliser un téléphone (autre qu’un sans fil) pendant un orage� Les éclairs
peuvent être à l’origine d’une électrocution�
16� N’utilisez pas le téléphone pour rapporter une fuite de gaz à proximité de celle-
ci� Sous certaines circonstances, une inteincelle pourrait survenir lorsque
l’adaptateur est branché à une prise de courant, ou lorsque le combiné est
déposé sur le combiné� Ceci est un événement commun associé avec la fermeture
d’un circuit électrique� L’utilisateur ne devrait pas brancher le téléphone dans
une prise de courant, et ne devrait pas déposer le combiné chargé sur le socle,
si le téléphone se trouve dans un environnement ou la concentration de gaz
inflammables, sans ventilation adéquate� Une étincelle dans ces endroits pourrait
provoquer un incendie ou une explosion� Ces environnements pourraient être
l’utilisation médicale de l’oxygène sans ventilation adéquate; le gaz industriel
(dissolvants, vapeurs d’essence, etc�); une fuite de gaz naturel, etc�
17� Placez uniquement le combiné de votre appareil près de votre oreille lorsqu’il est
en mode de conversation normal�
18� Les adaptateurs sont conçus pour être orientés en position verticale ou en
position horizontale sur le plancher�
19� N’utilisez que cordon d’alimentation et les piles indiquées dans ce guide
d’utilisation�
20� Pour les PRODUITS À BRANCHER À UNE PRISE DE COURANT, la prise de courant
doit être installée près du produit, afin d’assurer une accessibilité sécuritaire à la
prise de courant�
21� En position de montage mural, assurez-vous de monter le socle du téléphone sur
le mur en alignant les oeillets avec les goujons de fixation de la plaque murale�
Ensuite, faites glisser le socle vers le bas sur les deux goujons de fixation jusqu’à
ce qu’il se verrouille en place� Ne fixez l’appareil qu’à des hauteurs ne dépassant
pas 2 mètres� Reportez-vous aux instructions complètes dans la section “Handset
Installation” à la page 17-21�

10
22� MISE EN GARDE : Éloignez les petits objets métalliques tels que les broches de
l’écouteur du combiné�
23� AVERTISSEMENT : Le produit inclus (ITE) dans ce guide doit être connecté
uniquement aux réseaux PoE sans être acheminé vers l’installation extérieure�
CONSERVEZ CES INSTRUCTIONS
Alimentation
électrique
Adaptateur électrique du chargeur du combiné :
5,0 V CC, 2 A (Numéro de modèle : NBS10B050200VUU)
Pile du combiné : Pile au lithium-ion de 3,7 V 1 500 mAh
(Numéro de modèle : 503860AR1500, Fabricant : Yiyang Corun
Battery Co�, Ltd�)
MISES EN GARDE
• La pile ne peut pas être soumise à des températures extrêmes hautes ou basses
pendant l’utilisation, l’entreposage ou le transport�
• La pile ne peut pas être soumise à une faible pression atmosphérique à haute
altitude pendant l’utilisation, l’entreposage ou le transport�
• La pile de ce produit est remplaçable� Il existe un risque d’explosion si la pile n’est
pas remplacée correctement�
• Le remplacement d’une pile d’un type incorrect peut entraîner une explosion ou la
fuite d’un liquide ou d’un gaz inflammable�
• Évitez de jeter une pile dans le feu ou dans un four chaud, ou d’écraser ou de
couper mécaniquement une pile, car cela peut provoquer une explosion�
• Évitez de laisser une pile dans un environnement où la température est
extrêmement élevée, ce qui pourrait provoquer une explosion ou une fuite de
liquide ou de gaz inflammable�
• Une pile soumise à une pression d’air extrêmement basse peut entraîner une
explosion ou une fuite de liquide ou de gaz inflammable�

11
Compliance
FCC part 15
This device complies with Part 15 of the FCC rules� Operation is subject to the
following two conditions: (1) This device may not cause harmful interference, and (2)
this device must accept any interference received, including interference that may
cause undesired operation�
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules� These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment� This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with
the instruction manual, may cause harmful interference to radio communications�
Operation of this equipment in a residential area is likely to cause harmful interference
in which case the user will be required to correct the interference at the user’s
expense�
Privacy of communications may not be ensured when using this phone�
Warning: Changes or modifications to this equipment not expressly approved by
the party responsible for compliance could void the user’s authority to operate the
equipment�
To ensure safety of users, the FCC/ISEDC has established criteria for the amount of
radio frequency energy that can be safely absorbed by a user or bystander according
to the intended usage of the product�
This product has been tested and found to comply with the FCC/ISEDC criteria�
The handset may be safely held against the ear of the user�
FCC Part 68
Consumer Information:
a� This equipment complies with Part 68 of the FCC rules and the requirements
adopted by the ACTA� On the back or bottom of this equipment is a label
that contains, among other information, a product identifier in the format
US:AAAEQ##TXXXX� If requested, this number must be provided to the telephone
company�
b� An applicable certification jacks Universal Service Order Codes (USOC) for the
equipment is provided (i�e�, RJ45C) in the packaging with each piece of approved
terminal equipment�
c� A plug and jack used to connect this equipment to the premises wiring and
telephone network must comply with the applicable FCC Part 68 rules and
requirements adopted by the ACTA� A compliant LAN cable (RJ45) and modular
plug is provided with this product� An RJ45 jack should normally be used for
connecting to the SIP equipment through the LAN cable� See installation
instructions for details�
d� If this equipment causes harm to the telephone network, the telephone company
will notify you in advance that temporary discontinuance of service may be
required� But if advance notice isn’t practical, the telephone company will notify
the customer as soon as possible� Also, you will be advised of your right to file a

12
complaint with the FCC if you believe it is necessary�
e� The telephone company may make changes in its facilities, equipment, operations
or procedures that could affect the operation of the equipment� If this happens
the telephone company will provide advance notice in order for you to make
necessary modifications to maintain uninterrupted service�
f� Should you experience trouble with this equipment, please contact
Snom Technology GmbH
1 [phone] (select option 2)
for repair or warranty information� If the equipment is causing harm to the
telephone network, the telephone company may request that you disconnect the
equipment until the problem is resolved�
g� Please follow instructions for repairing if any (e�g� battery replacement section);
otherwise do not alternate or repair any parts of device except specified�
h� Connection to party line service is subject to state tariffs� Contact the state public
utility commission, public service commission or corporation commission for
information�
i. NOTICE: If you have specially wired alarm equipment connected to the telephone
line, ensure the installation of this product does not disable your alarm
equipment�
If you have questions about what will disable alarm equipment, consult your
telephone company or a qualified installer�
j� This equipment is hearing aid compatible�
NOTICE: According to telephone company reports, AC electrical surges, typically
resulting from lightning strikes, are very destructive to telephone equipment
connected to AC power sources� To minimize damage from these types of surges, a
surge arrestor is recommended�
Industry Canada
This Class A digital apparatus complies with Canadian requirements:
CAN ICES-3 (A)/NMB-3(A)� Cet appareil numérique de la classe A est conforme à la
norme CAN ICES-3 (A)/NMB-3(A) du Canada�
This device contains licence-exempt transmitter(s)/receiver(s) that comply with
Innovation, Science and Economic Development Canada’s licence-exempt RSS(s)�
Operation is subject to the following two conditions: (1) this device may not cause
interference, and (2) this device must accept any interference, including interference
that may cause undesired operation of the device�
Privacy of communications may not be ensured when using this telephone�
The term ‘’IC:‘’ before the certification/registration number only signifies that the
Industry Canada technical specifications were met�
This product meets the applicable Innovation, Science and Economic Development
Canada technical specifications�

13
Introduction
About this manual
This user manual provides installation and handset configuration instructions, and
detailed instructions for using the M55 KLE SIP DECT Handset�
See “Viewing handset status” on page 60 for instructions on how to check the
software version of your M55 KLE SIP DECT Handset and/or M500 Multi-cell SIP DECT
Base Station�
Please read Important Safety Information on page 5 of this user manual�
Please thoroughly read this user manual for all the feature operations and
troubleshooting information necessary to install and operate your handset�
Please refer to the Snom Servicme Hub at service.snom.com for complete
configuration instructions�
For customer service or product information, visit our website at
www.snomamericas.com�

14
Product overview
The M55 KLE SIP DECT Handset, combined with the M500 Multi-cell SIP DECT Base
Station, is a full-featured SIP endpoint business phone system designed to work with
popular hosted IP PBX services and on-premise SIP PBXs� Once you have ordered and
configured your PBX service, the handset enables you to make and receive calls as you
would with any other business phone�
Up to eight M55 handsets/M58 desksets can be registered per M500 base station�
The initial release of the M500 will support two M500 base stations connected in dual-
cell operation, but subsequent firmware releases will support additional M500 base
stations connected in multi-cell operation� Each handset provides calling features
such as hold, transfer, conferencing, and speakerphone�
The M500 Multi-cell SIP DECT Base Station supports shared calls among multiple
cordless handsets/desksets with a single SIP account� With Shared Call Emulation, the
Programmable Feature Keys (PFKs) can be configured as KeyLine type, which enables
the keys to be used as for making calls, picking up held calls, and barging in calls�
The features of the M55 KLE SIP DECT Handset include:
• 2�4” color display
• Speakerphone, Hold and Mute
• Up to 8 SIP accounts per M500 base station
• Up to 8 concurrent calls per M500 base station
• Shared Call Emulation -- Shared call usage on single SIP account among
multiple handsets/desksets
• 6 Programmable Feature Keys (PFKs) numbered 1-6 with LEDs
• 3 Soft Keys
• Message waiting alert LED
• 3-way conferencing
• Integrated Bluetooth for headset support
• Corded headset support
• Programmable key for multicast paging
• 400-entry local directory
• 1,000-entry shared directory with entries shared on all registered handsets
and desksets
• Antibacterial plastic

15
Quick Reference Guide
Cordless handset external features
10
6
9
13
11 14
8
7
1
2
3
4
55
12
7SPEAKER key
8 Alphanumeric keypad
9 Microphone
10 - VOLUME + key
11 Programmable key
12 OFF/Cancel key
13 Belt clip
14 Speaker
1 Earpiece
2MESSAGE LED
3 Color screen
4 Soft keys
5 Programmable Feature Keys
(PFKs) 1-6
6¡MENU/Confirm key and
navigation keys

16
Factory Default Programmable Feature Key (PFK) Settings
Your handsets have a factory default configuration
where the PFKs (1to 4) are set up to handle calls on a
shared line�
• All handset users can use the shared line via
the PFKs�
• The LEDs on the PFKs will be on or flashing to
indicate calls in progress across all handsets/desksets�
• A handset user can make a new call, pick up a held shared call, or barge in a
shared call by pressing the PFKs�
For more information, see “Using Shared Call Emulation” on page 46�
Please note that the PFKs may be configured differently on your phone
system� For example, a PFK might be used for a private line, to turn
DND on/off, etc� To see how the PFKs are configured on your handset,
press PFK 1-6 on the idle screen�
illustration scale 100%
Jinwook Hwang | 10. Mar. 2021 | Revision 7.1AW / SNOM M55 HS

17
Handset Installation
This section assumes that your network infrastructure is established and that your IP
PBX phone service has been ordered and configured for your location�
Handset installation involves both the handset and the handset charger� The charger is
powered using the supplied power adapter� The charger can be placed on a flat surface
or mounted on a wall�
Avoid placing the handset and charger too close to:
• Communication devices such as television sets, DVD players, or other
cordless telephones
• Excessive heat sources
• Noise sources such as a window with traffic outside, motors, microwave
ovens, refrigerators, or fluorescent lighting
• Excessive dust sources such as a workshop or garage
• Excessive moisture
• Extremely low temperature
• Mechanical vibration or shock such as on top of a washing machine or work
bench

18
Installing the charger
Install the charger as shown below�
Plug the power adapter into an electrical outlet not controlled by a wall switch�
Use only
Supplied
Adapter
RESET
Use only
Supplied
Adapter
RESET
Use only
Supplied
Adapter
RESET
~
~
Use only
Supplied
Adapter
RESET
Use only
Supplied
Adapter
RESET
Use only
Supplied
Adapter
RESET
~
~

19
IMPORTANT INFORMATION
1� Use only the power adapter supplied with this product�
To order a replacement power adapter, visit our website at
www.snomamericas.com�
2� The power adapter is intended to be correctly oriented in a vertical or floor mount
position� The prongs are not designed to hold the plug in place if it is plugged into
a ceiling, under-the-table or cabinet outlet�
Battery installation and charging
Install the battery as shown on the following page� Once you have installed the
battery, the screen indicates the battery status (see the table below)� If necessary,
place the handset in the charger to charge the battery� For best performance, keep the
handset in the charger when not in use� The battery is fully charged after 11 hours of
continuous charging�
If the screen is blank, you need to charge the handset without interruption for at least
30 minutes to give the handset enough charge to use the telephone for a short time�
When the battery is low, the handset shows a flashing Very low battery icon or
Low battery icon �
Battery indicators Battery Status Action
The screen is blank or
Very low battery icon
flashes�
The battery has no or
little charge� The handset
cannot be used�
Charge without
interruption (at least 30
minutes)�
Low battery icon
flashes�
Battery has enough
charge to be used for a
short time�
Charge without
interruption (at least 30
minutes)�
Full battery icon
appears�
Battery is charged� To keep the battery
charged, place it in the
charger when not in use�

20
To install the handset battery:
1� Place the top of the battery in the handset battery compartment so that the
battery connectors are aligned�
2� Push the bottom of the battery down into the battery compartment�
3� Align the cover flat against the battery compartment, then slide it upwards until it
clicks into place�
Rechargable Li-ion battery MODEL: 503860AR1500 Battery Capacity: 1500mAh 3.7V Energy: 5.55Wh Date:2021.04 Manufacturer: Yiyang Corun Battery Co., Ltd
CAUTION
- Using the wrong type of battery has a risk of explosion - Please recycle used batteries according to local government regulations Made in China
Pb
Li-Ion
Li-ion
Rechargable Li-ion battery MODEL: 503860AR1500 Battery Capacity: 1500mAh 3.7V Energy: 5.55Wh
Date:2021.04
Manufacturer: Yiyang Corun Battery Co., Ltd
CAUTION
- Using the wrong type of battery has a risk of explosion - Please recycle used batteries according to local government regulations
Made in China
Pb
Li-Ion
Li-ion
Rechargable Li-ion battery MODEL: 503860AR1500 Battery Capacity: 1500mAh 3.7V Energy: 5.55Wh Date:2021.04 Manufacturer: Yiyang Corun Battery Co., Ltd
CAUTION
- Using the wrong type of battery has a risk of explosion - Please recycle used batteries according to local government regulations Made in China
Pb
Li-Ion
Li-ion