Vtech SIP Series 1 Line SIP Hidden Base

Important safety instructions

The applied nameplate is located at the bottom or rear of the product.
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 zone 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 telephone base and 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 telephone base or 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 authorised service facility. Opening or removing parts of the Telephone base 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.
14. Unplug this product from the wall outlet and refer servicing to an authorised service facility under the following conditions:
    • When the power supply cord or plug is damaged or frayed.
    • If liquid has been spilled onto the product.
    • If the product has been exposed to rain or water.
    • 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 authorised technician to restore the product to normal operation.
    • If the product has been dropped and the telephone base and/or handset has been damaged.
    • 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; petrol vapours; 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 and batteries indicated in this manual. Do not dispose of batteries in a fire. They may explode. Check with local codes for possible special disposal instructions.
20. 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. Refer to the full instructions in Installation in the user’s manual.
21. This product should be mounted at a height of less than 2 meters.
22. Listed PoE (The product is considered not likely to require connection to an Ethernet network with outside plant routing).

 CAUTIONS

• Keep small metallic objects such as pins and staples away from the handset receiver.
• Risk of explosion if battery is replaced by incorrect type;
• Dispose of used batteries according to the instructions;
• Disconnect the telephone line before replacing batteries;
• For pluggable equipment, the socket-outlet (power adaptor) shall be installed near the equipment and shall be easily accessible;
• The applied nameplate is located at the bottom of the product;
• The equipment is only use for mounting at heights <2m.
• Avoid using the battery in the following conditions:-
  • High or low extreme temperatures that a battery can be subjected to during use, storage or transportation;
  • Low air pressure at high altitude;
  • Replacement of a battery with an incorrect type that can defeat a safeguard;
  • Disposal of a battery into fire or a hot oven, or mechanically crushing or cutting of a battery that can result in an explosion;
  • Leaving a battery in an extremely high temperature surrounding environment that can result in an explosion or the leakage of flammable liquid or gas;
  • Extremely low air pressure that can result in an explosion or the leakage of flammable liquid or gas.

Parts check list

Items contained in the respective cordless telephone package:

Model name

Model number

Parts included

Telephone base

Telephone base wall mounting plate | Network cable

Cordless handset and Handset battery (preinstalled in the handset)

Handset charger| Handset charger adapter

1-Line SIP Hidden Base with Cordless Colour Handset and Charge

CTM-S2116

1-Line SIP Hidden Base

CTM-S2110

Model name

Model number

Parts included

Telephone base| Telephone base Adapter

Telephone base wall mounting plate | Network cable

Cordless handset and Handset battery (preinstalled in the handset)

Handset charger| Handset charger adapter

1-Line Cordless Colour Handset and Charger

NGC-C3416(Virtual bundle of NGC-C5106and C5016)

Telephone layout

1-Line SIP Hidden Base with Cordless Colour Handset and Charger – CTM-S2116 1-Line Cordless Colour Handset – NGC-C5106 Charger – C5016

Handset

1	Battery charging light
2	Colour screen
3	Soft keys (3)Perform the action indicated by the on-screen labels.
4	MESSAGES key
5	TALK key
6	VOLUME /navigation keys
7	Numeric dial keys
8	SPEAKER key
9	MUTE key
10	Handset earpiece
11	Speakerphone
12	FRONT DESK key
13	OFF/Cancel key
14	EMERGENCY key
15	Microphone

Handset Charger and Adapter

Screen icons

1-Line SIP Hidden Base with Cordless Colour Handset and Charger – CTM-S2116 Line SIP Hidden Base – CTM-S2110

Telephone base

Installation

1-Line SIP Hidden Base with Cordless Colour Handset and Charger – CTM-S2116
1-Line SIP Hidden Base – CTM-S2110

Telephone base 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. For more information about IP PBX configuration, please refer to the SIP Phone Configuration Guide.
• You can power the base station using a power adapter (model VT07EEU05200(EU), VT07EUK05200(UK)) or Power over Ethernet (PoE Class 2) from your network. If you are not using PoE, install the base station near a power outlet not controlled by a wall switch. The base station can be placed on a flat surface or mounted on a wall in a vertical or horizontal orientation

To install the Telephone base:

• Plug one end of the Ethernet cable into the Ethernet port on the rear of the Telephone base (marked by NET), and plug the other end of the cable into your network router or switch.
• If the Telephone base is not using power from a PoE-capable network router or switch:
• Connect the power adapter to the Telephone base power jack.
• Plug the power adapter into an electrical outlet that is not controlled by a wall switch.

IMPORTANT INFORMATION

1. Use only the VTech power adapter (model VT07EEU05200(EU), VT07EUK05200(UK)). To order a power adapter, call +44 (0)1942 26 5195 or email vtech@corpteluk.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.

To mount the Telephone base on the wall

1. Install two mounting screws on the wall. Choose screws with heads larger than 5 mm (3/16 inch) in diameter (1 cm / 3/8 inch diameter maximum). The screw centers should be 5 cm (1 15/16 inches) apart vertically or horizontally.
2. Tighten screws until only 3 mm (1/8 inch) of the screws are exposed.
3. Attach the mounting plate to the top of the Telephone base. Insert the tab into the slot and then push the plate in at the bottom of the Telephone base until the mounting plate clicks into place.
4. Check to make sure the plate is secure at top and bottom. It should be flush with the Telephone base body.
5. Place the Telephone base over the mounting screws.
6. Connect the Ethernet cable and power as described on page 10.

1-Line SIP Hidden Base with Cordless Colour Handset and Charger -CTM-S2116 1-Line Cordless Colour Handset -NGC-C5106 Charger – C5016

Handset Charger Installation

• Install the handset charger as shown below.
• Make sure the supplied power adapter is securely plugged into an outlet not controlled by a wall switch.
• The battery is fully charged after 11 hours of continuous charging. For best performance, keep the handset in the handset charger when not in use.

CAUTIONS
Use only the supplied power adapter. The supplied power adapter is not designed for use in any other devices. Misuse of it on your other devices shall be prohibited. To order a replacement, call +44 (0)1942 26 5195 or email vtech@corpteluk.com.

Installation Notes
Avoid placing the Telephone base, handset, or handset 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

Handset Registration
Follow the steps below to register your cordless handset to the Telephone base.
You can register additional cordless handsets to the Telephone base. The Telephone base accommodates up to four NGC-C5106 or CTM-C4402 cordless handsets.

1. On the cordless handset, press the Lang soft key, and then the key sequence: 7 5 6 0 0 #.
   The key sequence will not be displayed on the screen when entered.
2. With Registration selected, press OK.
3. With Register Handset selected, press Select.
   The handset displays the message “Long press the FIND HANDSET button on your base”.
4. On the Telephone base, press and hold the / FIND HANDSET button for at least four seconds, then release the button. Both LEDs on the Telephone base begin to flash.
   The handset displays “Registering handset”.
   The handset beeps and displays “Handset registered”.

Handset Deregistration

1. When a registered cordless handset is idle, press the Lang soft key, and then the key sequence: 7 5 6 0 0 #.
   The key sequence will not be displayed on the screen when entered.
2. With Registration selected, press OK. 3. Press to select Deregister, and then press Select.
3. Press to select the handset you want to deregister, and then press Select.

NOTE: The handset you are currently using is indicated by **.
The handset beeps and displays “HANDSET deregistered”.

Handset battery charging
The battery must be fully charged before using the cordless handset for the first time. The battery charge light turns on when the cordless handset is charging on the handset charger. The battery is fully charged after 11 hours of continuous charging. For best performance, keep the cordless handset in the handset charger when not in use.

Replacing a Cordless Handset Battery
The cordless handset battery is preinstalled. To replace the cordless handset battery, follow the steps below.

1. Use a narrow object to pry open the handset cover, so that you unsnap the tabs at the locations indicated below.
2. Place your thumb in the slot below the battery, and lift the battery out of the handset battery compartment.
3. Place the top of the battery in the handset battery compartment so that the battery connectors are aligned.
4. Push the bottom of the battery down into the battery compartment.
5. To replace the handset cover, align all the tabs on the handset cover against the corresponding grooves on the handset, then firmly push downward until all the tabs lock in the grooves.

CAUTIONS
There may be a risk of explosion if a wrong type of handset battery is used. Use only the supplied rechargeable battery or replacement battery. To order a replacement, call +44 (0)1942 26 5195 or email vtech@corpteluk.com.
Dispose of used batteries according to the instructions.

Set up

1-Line SIP Hidden Base with Cordless Colour Handset and Charger – CTM-S2116
Default settings are indicated by asterisks (*).

All telephone settings are programmed through the administrative web portal. Please refer to the SIP Phone Configuration Guide for details.

Operation

1-Line SIP Hidden Base with Cordless Colour Handset and Charger – CTM-S2116
1-Line Cordless Colour Handset -NGC-C5106

Using the cordless handset
When you use the keypad of the cordless handset, the handset keys are backlit.

Change handset screen language
To change the display language of your handset colour screen:

1. Press Lang.
2. Press to select a language.
3. Press OK.

Receive a call
When there is an incoming call, the handset rings.
Answer a call using the cordless handset while it is not on the handset charger

• On the cordless handset, press Ans or or .
• The icon appears in the middle of the screen when in speakerphone mode. screen when in speakerphone mode.
• Answer a call using the cordless handset while it is cradled on the handset charger

Lift the cordless handset from the handset charger.

1. Reject a call Press
2. Reject or

Place a call

1.  On the cordless handset, use the keypad to enter the number.
   • Press Delete if you enter an incorrect digit.
2. Press Dial or
3. To end the call, press End or or place the handset in the charger.

Place a call during an active call

• During a call, press New on the cordless handset.
• The active call is placed on hold.
• Use the keypad to enter the number. If you enter an incorrect digit, press Delete.
• Press Dial.

End a call
Press on the cordless handset or place it in the handset charger. The call ends when all handsets hang up.

Switching between calls
If you have an active call and another call on hold, you can switch between the two calls.

1. Press Switch to put the active call on hold, and resume the held call.
2. To end the active call, press End or The other call will remain on hold.
3. Press Unhold to take the call off hold.

Share a call
A maximum of two cordless handsets can be used at the same time on an external call.

Join a call
To join an active call that is taking place on another handset, press Join.

Hold

• To place a call on hold:
• During a call, press Hold on the cordless handset.
• To take the call off hold, press Unhold.

Speakerphone

• During a call, press on the cordless handset to switch between speakerphone mode and handset earpiece mode.
• The icon appears in the middle of the screen when in speakerphone mode.

Volume
Adjust the listening volume

1. During a call, press to adjust the listening volume.
2. Press OK.

Adjust the Ringer volume

1. When the cordless handset is idle, press to adjust the ringer volume.
2. Press OK.

Mute
Mute the microphone

1. During a call, press on the cordless handset.
   The handset displays “Call Muted” when the mute function is turned on. You can hear the party on the other end but they cannot hear you.
2. Press again to resume the conversation.

• Press Ans on the cordless handset. The active call is put on hold.

• Press Reject on the cordless handset.

1. Press SpdDial.
2. Press to select a speed dial entry.
3. Press OK.

Alternatively, you can press a speed dial key ( or ), or press a speed dial soft key (for example, RmServ).

Message waiting indicator
When a new voice message is received, the handset displays ” New msg” on the screen.

1. When the phone is idle, press
   The handset dials the voicemail access number.
2. Follow the voice prompts to play your messages.

• Press / FIND HANDSET on the Telephone base when the phone is not in use. All idle cordless handsets beep for 60 seconds.

• Press / FIND HANDSET again on the Telephone base. -OR-
• Press on the cordless handset.

VTech Hospitality Limited Warranty Program

1. Product or parts that have been subjected to misuse, accident, shipping or other physical damage, improper installation, abnormal operation or handling, neglect, inundation, fire, water or other liquid intrusion; or
2. Product that has been damaged due to repair, alteration or modification by anyone other than an authorised service representative of VTech; or
3. Product to the extent that the problem experienced is caused by signal conditions, network reliability or cable or antenna systems; or
4. Product to the extent that the problem is caused by use with non-VTech accessories; or
5. Product whose warranty/quality stickers, product serial number plates or electronic serial numbers have been removed, altered or rendered illegible; or
6. Product purchased, used, serviced, or shipped for repair from outside the local dealer / distributor, or used for non-approved commercial or institutional purposes (including but not limited to Products used for rental purposes); or
7. Product returned without valid proof of purchase; or
8. Charges or costs incurred by the end user, and risk of loss or damage, in removing and shipping the Product, or for installation or set up, adjustment of customer controls, and installation or repair of systems outside the unit.
9. Line cords or coil cords, plastic overlays, connectors, power adapters and batteries, if the Product is returned without them. VTech will charge the end user at then-current prices for each of the missing items.
10. NiCd or NiMH handset batteries, or power adapters, which, under all circumstances, are covered by a one (1) year warranty only.

Maintenance

• Avoid rough treatment
  Place the handset down gently. Save the original packing materials to protect your telephone if you ever need to ship it.
• Avoid water
  Your telephone can be damaged if it gets wet. Do not use the handset outdoors in the rain, or handle it with wet hands. Do not install the telephone base near a sink, bathtub or shower.
• Electrical storms
  Electrical storms can sometimes cause power surges harmful to electronic equipment. For your own safety, take caution when using electrical appliances during storms.
• Cleaning your telephone
  Your telephone has a durable plastic casing that should retain its luster for many years. Clean it only with a soft cloth slightly dampened with water or mild soap. Do not use excess water or cleaning solvents of any kind.

• For proper treatment, recovery and recycling of old products and batteries, please take them to applicable collection points in accordance with your national legislation.
• By disposing of them correctly, you will help to save valuable resources and prevent any potential negative effects on human health and the environment.
• For more information about collection and recycling, please contact your local municipality. Penalties may be applicable for incorrect disposal of this waste, in accordance with national legislation.

Product disposal instructions for business users

• If you wish to discard electrical and electronic equipment, please contact your dealer or supplier for further information.
• Information on Disposal in other countries outside the European union
• These symbols (1, 2) are only valid in the European Union. If you wish to discard these items, please contact your local authorities or dealer and ask for the correct method of disposal.

Note for the battery symbol
This symbol (2) might be used in combination with a chemical symbol. In this case it complies with the requirement set by the Directive for the chemical involved.

Technical specifications

1-Line SIP Hidden Base with Cordless Colour Handset and Charger – CTM-S2116 1-Line SIP Hidden Base – CTM-S2110
1-Line Cordless Colour Handset – NGC-C5106

Charger – C5016

Specifications are subject to change without notice.

Copyright © 2025
VTech Telecommunications Limited
All rights reserved. 6/25.
CTM-S2116_CTM-S2110_NGC-C3416HC_UG_EU-UK_19JUN2025

Appendix

Troubleshooting
If you have difficulty with the telephones, please try the suggestions below. For customer service, call +44 (0)1942 26 5195 or email vtech@corpteluk.com.
For cordless telephone

Question	Suggestions
2.  I cannot dial out.	Try all the above suggestions. A prefix may be required for dialling some internal or external calls. Refer to the SIP Phone Configuration Guide for details. • Check your SIP server settings. If other SIP telephones in your hotel are having the same problem, the problem is in the wiring or network server. Contact your telephone service provider (charges may apply).
3. The Speed Dial key does not work at all.	The Speed Dial key may not be properly programmed. Refer to the SIP Phone Configuration Guide for details.
4. The telephone cannot register to the SIP network server.	Make sure your network is providing Power over Ethernet (PoE). Make sure the initialisation and system registration process completes. Disconnect the Cat-5 network cable from the network wall jack and connect it back into the network wall jack with Power over Ethernet (PoE) to start the initialisation and system registration process again.
5. The LOW BATTERY icon         or the EXTREMELY LOW BATTERY iconappears at the top of the cordless handset screen.	Place the cordless handset in the handset charger for recharging. Remove the battery and then install it again, and use it until fully depleted. Then charge the cordless handset in the handset charger for up to 11 hours. If the above measures do not correct the problem, replace the battery.

Documents / Resources

Vtech SIP Series 1 Line SIP Hidden Base [pdf] User Guide CTM-S2116, CTM-S2110, NGC-C3416HC, SIP Series 1 Line SIP Hidden Base, SIP Series, 1 Line SIP Hidden Base, Line SIP Hidden Base, SIP Hidden Base, Hidden Base

References

• User Manual