Siemens Gigaset SX303 ISDN
Front features Display Illuminated display Operations controlled LED signalling Date and time displayed Call duration per call displayed Special Features Handsfree talking Baby phone / room monitoring Alarm call and date reminder Open listening at basestation Multilingual menu Support for Gigaset Repeater Dialing features Voice dialing Redialing function Phone directory Pre-dialing Automatic redialing Pre-selection of Netprovider Call list with timestamp and dialling facility ISDN features Connection Administration of telephone numbers Clock feature Dialing functions graphic: 4 lines yes via menu via MWI key yes yes yes yes yes yes 17 languages yes depends on mobile unit yes 100 entries yes yes manually for up to 40 entries
point to multipoint yes, for up to 10 synchronising via ISDN */# dial / kepad / DTMF within call hold, consultation, toggle, accept/reject, Call functions forwarding, deflection, three-party conference Private telephone system yes CLIP (depending on country and network) yes CW (call waiting) yes CCBSR/CCNRS (call completition on yes busy subscriber/no reply) ECT (exclusive call transfer) yes MCID (malicious call identification) yes AOC (advice of charge) yes TP (terminal portability) yes

After the call, the setting is reset again. Your phone number will be identified to your next caller. When you call the selected phone number from the last number redial list again, this call is also not anonymous.
Withholding or permitting identification of your phone number for all calls: When the phone is supplied Withhold no. is not activated.
i s Set base s Settings s ISDN settings s Withhold no. j

OK OK OK OK

Select the menu item and confirm. Select the menu item and confirm. Select the menu item and confirm. Hold down (back to idle status). Select the menu item and confirm ( = activated).
Activating/deactivating handsfree and open listening
The function of the handsfree key d depends on the current status of your base station: Your base station is in idle status: Activate handsfree while dialling:
Enter the number and press the handsfree key.
You are making a call using the receiver or you are making a call using the receiver and you have activated open listening: Activating/deactivating open listening:

d d+c a

Press the handsfree key. Activating handsfree during a call: Hold down handsfree key and replace receiver. End the call: Replace the receiver.
You are making a call using the handsfree function: Deactivate handsfree:
Lift the receiver. End the call: Press the handsfree key. You can adjust volume during handsfree operation using und.
Picking up a call during ring delay (Call Pickup)
You can pick up a call despite a ring delay (page 105) being set. Preconditions: The subscriber who picks up the call must have at least Incoming only authorisation (page 92). Both parties must be assigned the same receive MSN (page 96).
Lift the receiver. Accept? is displayed. Confirm to pick up the call.

Rejecting a call

You get an external call or you are making a call and receive an external call. The call is signalled acoustically and also shown in the display on all telephones or handsets in this MSN group. You can reject this external call. Press the display key REJECT. Depending on the setting (page 98) the call can be rejected on the base station rejecting the call only (telephones or handsets with the same receive MSN continue to ring) or it can be rejected for the entire MSN group (the caller hears the busy tone).

Reserving a line

Your ISDN connection offers you 2 simultaneously usable telephone lines (B channels). Precondition: You want to make calls externally, but both telephone lines of your connection are busy (being used by other internal users). Press the display key CALLBCK. The next available free line will be reserved for you. You base station rings as soon as an external line is free. either.
[RRRRRRRRRRRRRRRRRRRRRRRRRRR] DELETE
Use a free line: Lift the receiver. You can now enter the phone number as usual. Delete the reservation: Press the display key. The reservation is cancelled.
If the reservation is neither accepted or deleted, it will be deleted automatically after 30 sec.
Defining the send MSN for the next call
Even if you have defined an individual send MSN for the base station (page 96), you can select another MSN as the send MSN before each call, e.g. for individual recording of charges. Make sure that the send/receive MSN corresponds to the phone number registered at your SMS centre (page 49). By factory default, MSN next call is not activated for an MSN.
i s Set base s Call preparat. s MSN next call s MSN1: j
Select the menu item and confirm. Select the menu item and confirm. Select the menu item and confirm. Select the required MSN and confirm ( = activated). The next call uses this MSN. Hold down (back to idle status).
The temporarily set send MSN is displayed as the phone number for
the person you are calling.
To make this function easier to use, you can also set one of the
function keys accordingly (page 117).
You can set up your base station so that after lifting the receiver or pressing the handsfree key d a list of all available send MSNs is displayed (page 97).
Callback on busy (CCBS) / on no answer (CCNR)
Precondition: The exchange supports this service. Callback on busy CCBS (Completion of calls to busy subscriber) The user you are calling is currently making a call. Automatic callback saves you making repeated attempts to dial the number. Callback on no answer CCNR (Completion of Calls No Reply) If the user you are calling does not answer you can arrange automatic callback. As soon as the user you require has finished a call and the line is free again you will be called back. The callback request is automatically cancelled after about 2 hours (depending on the exchange).

Manual last number redial
k Open the last number redial list. Select an entry and lift the receiver. The phone number is dialled.-{} To add or change the phone number, press WsDisplay Number
When a name is displayed, you can press W s Display entry OK
to display the associated phone number. number redial list (page 38).
You can add the phone numbers to your Phonebook from the last
Defining the MSN for the next call You can select a valid send MSN for this call only even when dialling from the last number redial list. Precondition: MSN next call must be activated (page 97). Select an entry and press W to open the submenu. Using Dial number OK displays the list of MSNs.
Using the Phonebook and other lists Automatic redial
With this function, the phone number of a party you did not reach is redialled automatically every 20 seconds. The handsfree key flashes and "Open listening" is activated. If the party answers, press the talk key c. "Open listening" remains activated. If the party does not answer, the call is terminated after approx. 30 seconds. The function switches itself off after twelve unsuccessful dialling attempts. To be able to use automatic redial from the last number redial list, MSN next call must be deactivated for the handset (page 97).

Automatic Redial OK

Press end call key. Open the last number redial list. The party who could not be reached is selected. Open the menu. Confirm.
To cancel automatic redial, press the display key CANCEL or any key.
A call in the meantime deactivates the automatic redial. You must activate it again afterwards.
Deleting a single phone number

sW s Delete entry j

Open the last number redial list. Select an entry and open the menu.
Opening lists with the message key
Providing a new entry is present in the relevant list, you can open the following lists using the message key f: 1. Incoming SMS message list Textmessage(SMS) (page 57) 2. List of missed calls Missed calls (page 42) 3. Answering machine lists AM1, AM2, AM3 (on base station SX353isdn, page 67) These lists display the calls, messages and text messages belonging to the receive MSN's assigned to the base station. As soon as a new entry (calls, messages on an integrated answering machine and/or SMS) were received in one or more lists, the key f flashes and an advisory tone is heard. If the flashing key f is pressed, the following is displayed: If only one list has new entries, you will see the first new entry in that list. Open entry: s (Select entry) OK If several lists have new entries, those lists are offered for your selection. Open entry: s (select list) OK, s (select entry) OK

Date and time of call Caller's phone number

10.12.09:45

Number of the message displayed Total number of messages in the list
If automatic pause is activated the answering machine switches to pause mode after playing back a message. Press the display key or the key to continue playback.
Jumping to the next or previous message during playback
Go to the next message. Skip to beginning of current message. Repeat the last 5 seconds of the current message. If less than 5 seconds have elapsed, the current message is played back from the beginning. Skip to previous message.

Continue OK

Switching to pause mode during playback, ending pause mode Switch to pause mode. Confirm. Continue playback.
Returning a call during playback
You can call back a caller immediately while a message is being played. Precondition: The caller's number has been identified. During playback: W either. Press the display key to open the submenu. Call back:

s Call back

Select the menu item and confirm. Call back using the network provider's phone number:
Select the menu item and confirm. Select the network provider's number and confirm.
Playing a message to another caller
During an external call you can play messages from the answering machine to the person you are calling. Precondition: The same receive MSN is assigned to the base station (or handset) and the answering machine. During the call: i
s Play message s AM1 ~ OK
Select the menu item and confirm. If necessary, select answering machine and confirm, e.g. AM1. If AM lock is set (page 80): enter the answering machine PIN and confirm. Information about the oldest message is displayed on the screen. The message is not played back. Select message and open the submenu.

sW s Playback

Select the menu item and confirm. The playback starts. The other party can hear the message being played. End playback: Press the display key to open the submenu.

s Exit

Select the menu item and confirm. The playback stops.

Select the menu item and confirm. Select the menu item and confirm. Select the menu item and confirm. Confirm. The list of internal numbers is displayed. Select the internal numbers for the answering machine (INT 91, INT 92 or INT 93). Open the submenu. Hide answering machine:

s Hide AM?

Select the menu item and confirm. Show answering machine: Select the menu item and confirm. Hold down (back to idle status).

s Show AM? j

When an activated answering machine is hidden it is deactivated. When it is set to show again, the answering machine returns to the status it had before it was hidden.
Specifying the number of rings before the answering machine starts
You can set when you want the answering machine to activate (after how many rings). The options are: 1 ring tone, 2 ring tone,., 9 ring tone. Instead of a set number of rings, you can also choose the cost saving setting Automatic 2/4 (factory default). In this setting the answering machine activates automatically: after 2 rings if there are new messages; after 4 rings if there are no new messages. When operating remotely (page 72) by the third ring you will know that there are no new messages (otherwise the answering machine would have already activated). There will be no call charges if you hang up now. Precondition: You have selected an answering machine (page 63).
s Settings s No. of rings s Automatic 2/4 j
Select the menu item and confirm. Select the menu item and confirm. Select the number of rings or Automatic 2/4 and confirm ( = set). Hold down (back to idle status).
Activating/deactivating voice announcement of date and time
You can have the recording date and time (time stamp) announced when each message/memo is played back (activated when supplied). Precondition: You have selected an answering machine (page 63).

s Settings

Message/Memo
Select the menu item and confirm. Confirm. Select the menu item and confirm ( = activated). Hold down (back to idle status).

s Time stamp j

Setting the recording time and recording quality
You can set the maximum length of a message and its recording quality. The recording quality determines the total recording time of your answering machine. On the High quality setting the total recording time is up to 12 min, on Long recording (standard quality, generally adequate) up to 25 min. The Long recording recording quality and the Maximum recording time are set by factory default. The recording of a call ends: after a pause in speaking lasting more than 8 seconds; at the end of a call; the caller terminates the connection; after the maximum set recording time has elapsed, if the setting Maximum was used, when the memory is full.

Select the menu item and confirm. Select the menu item and confirm. Select MSN and confirm, e.g. MSN1: Anna. Hold down (back to idle status). Select the menu item and confirm ( = activated).
Activating/deactivating Night service You can only activate night service if you have entered a divert destination for the receive MSN and if no call diversions are currently activated.
i s Set base s Night service s MSN1:
Select the menu item and confirm. Select the menu item and confirm. Select MSN and confirm, e.g. MSN1: Anna. Activating Night service: Select the menu item and confirm. Deactivating Night service: Select the menu item and confirm. Hold down (back to idle status).
If Night service is activated for an MSN, Night service is marked with.
SX303/353isdn / englisch / A31008-X353-B100-2-7619 / security.fm / 14.11.2005

Security settings

Changing the system PIN
You can protect the following settings against unauthorised access using the system PIN (Personal Identification Number): Call charges and settings Internal and external call diversion SMS service centres, subscriber configurations, security, ISDN and system settings Getting started wizard The system PIN is also necessary to register Bluetooth devices, e.g. for GSM telephones (page 127) and PCs (page 127). The system PIN will not work with the number 0000. When supplied, the system PIN is preconfigured to 0000.
i s Set base s Settings ~ OK

Security Change PIN

Select the menu item and confirm. Select the menu item and confirm. Providing you choose a number other than 0000: Enter PIN and confirm.
Confirm. Select the menu item and confirm. Enter new system PIN (up to 8 digits, 0 to 9) and confirm. Repeat the new system PIN and confirm. Hold down (back to idle status).
Memorise the new system PIN! If you forget it, the device will require technical intervention. If this happens, contact the Siemens Hotline.

Defining authorisation

You can set different authorisations for all registered devices: Unrestricted (set as factory default) All devices can answer incoming calls and make outgoing external/internal calls. Incoming only The devices can only answer incoming external calls. External outgoing calls are not possible. Internal calls (outgoing and incoming) are possible. Emergency numbers can be dialled. Internal only The devices can only be used for internal calls (incoming and outgoing). Emergency numbers can be dialled.

Wire-based PC connection: Base station USB port
You can establish a wire-based connection to a PC via the USB port on your base station. A wire-based connection via the USB port on the base station provides you with a 128 kbit/sec interface. The internal number PC 40 on your base station is provided for this purpose.
SX303/353isdn / englisch / A31008-X353-B100-2-7619 / pabx.fm / 14.11.2005
Operating when connected to a PABX
If you are operating your base station on a PABX, special characteristics for receiving text messages should be noted (page 61).

Access code

Precondition: If your phone is connected to a PABX you may have to enter an access code (outside line code) for external calls when first getting started, depending on the PABX. See the operating instructions for your PABX. You can enter a one to four-digit access code. For incoming calls, the access code is automatically placed in front of the caller's phone number in the display and in the caller lists, and likewise when copied to the Phonebook. The saved phone number can then be dialled directly, e.g. from the caller list (page 42).
i s Set base s Settings ~ OK s System settings s Access code ~W s Save entry
Select the menu item and confirm. Select the menu item and confirm. Enter system PIN if required (page 91). Select the menu item and confirm. Select the menu item and confirm. Enter access code and open the menu. Confirm.
For manual dialling and entering Phonebook, emergency and direct dial numbers you must also enter the access code.
Activating/deactivating call transfer ECT (Explicit Call Transfer)
Precondition: If you want to connect two callers directly with one another (p. 35), then this function must be activated. By factory default, this function is deactivated.
i s Set base s Settings ~ OK s ISDN settings s Transfer(ECT)
If you activate this function, it will automatically be switched to the Ext. enq. call (= in the telephone exchange) (page 29).

Dialling options

The KEYPAD function allows you to control certain services by entering sequences of characters and digits. The KEYPAD function must be set when connecting your Gigaset SX303/353isdn to an ISDN PABX or to a telephone exchange (e.g., Centrex) which uses the KEYPAD protocol for control. The digits/characters 09, *, # are sent as keypad information elements. Please inquire of your service provider about which information and codes you can transmit. If your Gigaset SX303/353isdn is integrated in a Centrex system, the following performance features can be used. Calling Name Identification (CNI) Message Waiting Indication (MWI) CENTREX call When you receive calls from other CENTREX subscribers, the caller's number and name are displayed on the screen. The display key J is offered on Comfort handsets if new calls appear in the caller list. Calling up the caller list deletes the display key J. The CENTREX call is signalled acoustically like an internal call.

Setting options

You can switch between the settings Standard dial (factory setting), Auto keypad and Dial * and #. Standard dial Once Standard dial has been activated, * and # are not transmitted during dialling, and if * and # are entered it is not possible to switch to the keypad. Auto keypad Once * or # has been entered, this setting automatically transfers ringing during dialling to the keypad. This automatic switchover is needed for giving commands to the exchange or PABX. Dial * and # Once Dial * and # has been activated, the * and # characters are transmitted during dialling as commands to the exchange or PABX. Regardless of the setting options above, after dialling or during the conversation, the phone switches automatically to tone dialling (DTMF), e.g. for remote control of an answering machine.
i s Set base s Settings ~ OK s System settings s Spec. function s Dial properties s Standard dial
Select the menu item and confirm. Select the menu item and confirm. Enter system PIN if required (page 91). Select the menu item and confirm. Select the menu item and confirm. Select the menu item and confirm. Select the setting and confirm, e.g. Standard dial ( = activated).
Activating/deactivating the keypad during a call
In addition to the ongoing settings described above, you can also switch over temporarily to the keypad. The setting is only applicable to the current external call and is automatically deactivated after the call is ended. During a call:
Open the menu. Activate the keypad:

s Keypad on? ~

Select the menu item and confirm. Enter the keypad code. Deactivate the keypad:

s Keypad off?

Activating the keypad for the next connection
All dialling characters (09, *, #) will be sent as a string of keypad characters with the next connection (dial and call). In the connection status, the keypad is retained and is not automatically switched over to tone dialling (DTMF).
i s Set base s Call preparat. s Temp. keypad
Select the menu item and confirm. Select the menu item and confirm. Select the menu item and confirm ( = activated).
SX303/353isdn / englisch / A31008-X353-B100-2-7619 / door_intercom.fm / 14.11.2005
Operation of entrance telephone
Setting up the entrance telephone
You can select two door types for your entrance telephone: Door type 1: for entrance telephones with door opening via ringing current (FTZ 123) one ringer button. Door type 2: for entrance telephones with DTMF control several programmable ringer buttons (page 140). The following internal number is provided for setting up an entrance telephone: Int.21

Lift the receiver. You are connected to the entrance telephone. The message Door appears in the display. Replace the receiver. Press the display key to operate the door opener. The door opener is activated. The display shows Door open as confirmation. The connection to the entrance telephone is automatically broken after the door is opened.
[RRRRRRRRRRRRRRRRRRRRRRRRRRR] OP DOOR
Entrance telephone call waiting
Accept call waiting Press the display key ACCEPT. You answer the waiting call. If the interrupted call is an internal call, the connection is broken when you accept the waiting call. If the interrupted call is an external call, it is put on hold when you accept the waiting call. Both parties are shown on the display, the current one is marked.
Internal call with entrance telephone
You can make an internal call to the entrance telephone (page 21).
Diverting the entrance telephone externally
Calls from the entrance telephone can be diverted to an external phone number. The internal subscribers from the entrance telephone call group are still called if an external call diversion is set up. The setting for the destination for external diversion, either in the exchange or in your base station (page 103) also applies to call diversion for the entrance telephone.
Entering/changing the destination number for external call diversion
i s Set base s Settings ~ OK s Setup user s Setup device s INT21: Int.21 s Forw. door call
Select the menu item and confirm. Select the menu item and confirm. Enter system PIN if required (page 91). Select the menu item and confirm. Select the menu item and confirm. Select internal user and open submenu. Select the menu item and confirm. Press the display key to display the destination phone number. If a destination phone number has not been recorded, the entry <empty> is shown. Press the display key to open the submenu.
Confirm. Enter a new or changed destination phone number and open the submenu. Confirm.
Operation of entrance telephone Deleting the destination number for external call diversion
Select the menu item and confirm. Select the menu item and confirm. Enter system PIN if required (page 91). Select the menu item and confirm. Select the menu item and confirm. Select internal user and open submenu. Select the menu item and confirm. Press the display key to display the destination phone number.

Service (Customer Care)

You can get assistance easily when you have technical questions or questions about how to use your device by using our online support service on the Internet at: www.siemens.com/gigasetcustomercare or by referring to the section entitled Questions and answers in this manual (page 147). If the device needs to be repaired, please contact one of our Customer Care Centers:
Abu Dhabi. 00 Argentina. Australia. 14 Austria. 04 Bahrain. 34 Bangladesh. 47 Belgium. 21 Bosnia Herzegovina. 49 Brazil. Brunei. Bulgaria. Cambodia. Canada. China. Croatia. 81 Czech Republic. 27 Denmark. Dubai. 33 Egypt. 11 Estonia. Finland. 00 France. 00 Germany.222 Greece. Hong Kong. Hungary. 44 Iceland. India. 89 - 98 Indonesia. Ireland. 77 Italy. 00 Ivory Coast. Jordan. 42 Kenya. Kuwait. Latvia. Lebanon. Libya. 82 Lithuania. 10 Luxembourg. Macedonia. Malaysia. 18 Malta. 32 Mauritius. Mexico.Morocco. Netherlands. 0900-3333102 New Zealand. 63 Norway. Oman. 12 Pakistan. 00 Philippines. 18 Poland. 30 Portugal. 04 Qatar. Romania. 00 Russia. (800) 10 Saudi Arabia. 43 Serbia. 85 Singapore. Slovak Republic. 66 Slovenia. 36 South Africa. 57 Spain. 61 Sweden. 11 Switzerland. 00 Taiwan. 04 Thailand. 18 Tunisia. 02 Turkey. Ukraine. United Arab Emirates. 78 United Kingdom. USA. Vietnam. 22 44
In some countries repair and replace services are impossible where the products are not sold through our authorised dealers. Your Gigaset is intended for operation in the countries indicated on the underside of the product and on the packaging.

Appendix Authorisation

This device is intended for the ISDN telephone connection in the UK. Country-specific requirements have been taken into consideration. We, Siemens Home and Office Communication Devices GmbH & Co. KG, declare that this device meets the essential requirements and other relevant regulations laid down in Directive 1999/5/EC. A copy of the 1999/5/EC Declaration of Conformity is available at this Internet address: http://www.siemens.com/gigasetdocs.

Gigaset C34 handset Illuminated graphic display Polyphonic ringer melodies Handsfree mode Phonebook for around 100 entries SMS (CLIP must be enabled) Room monitor Timer www.siemens.com/gigasetc34
Gigaset C32/C2 handset Graphic display with date and time Phonebook for around 100 entries Handsfree mode SMS EATONI predictive text Caller-based ringer melody setting (for VIP calls) Room monitor Walkie talkie mode
Gigaset repeater The Gigaset repeater can be used to increase the reception range of your Gigaset handset to the base station.
Gigaset M34 USB data adapter The Gigaset M34 USB is used to establish a wireless connection between your PC and your Gigaset. This allows: wireless Internet surfing on your PC, convenient configuration of your Gigaset on the PC management of handset directories, management of call lists (journal), use of the dialler blocker to protect against unwanted high-cost connections. www.siemens.com/gigasetm34usb The following accessories are connected to the handset: Mobile handsfree set with P2T key With the mobile handsfree set you can make a call while keeping your hands free.
Data cable DCA-500 For connecting your handset to the serial RS232 interface on your computer. Data Cable USB DCA-510 For connecting your handset to the USB interface on your computer.
All accessories and batteries are available from your phone retailer. Only use original accessories. This will avoid possible health risks and damage, and also ensure that all the relevant regulations are complied with.
SX303/353isdn / englisch / A31008-X353-B100-2-7619 / glossary.fm / 14.11.2005

Glossary

Added-feature connection ISDN connection that offers three more services than the standard connection: Call forwarding, transfer of charges after the connection, and a T-mailbox. AM PIN Abbreviation for answering machine PIN AOC-D Advice of Charge: During the Call. Transfers the charge information during the connection. AOC-E Advice of Charge: At the End of the Call. Transfers the charge information at the end of the connection. Authorisation class Defines which connections are permitted on PABX terminals, e.g., internal only, incoming only, or unlimited call authorisation. Authorisation for direct outward dialling Different users may be assigned different levels of authorisation on a base station. For example, while User A may only take incoming calls, User B may make calls without restriction. Automatic callback See "Callback on busy" Automatic redial Several attempts to call are made automatically when the line is busy.

Block dialling Also pre-dialling. You may only dial or, if required, correct the phone number. Then you should lift the receiver or press the loudspeaker key. BluetoothTM BluetoothTM (named after King "Bluetooth" of Denmark who entered into an association with the Norwegians around a thousand years ago) is an economical standard for high-speed wireless transmission of voice and data between different electronic devices such as notebooks, PDAs (personal digital assistants), printers and mobile phones across distances of up to 10 metres. Bluetooth signals do not have a preferential direction and can, in principle, be received by any users within range. Bluetooth devices detect one another automatically.

Glossary C

Call diversion (via second B channel / internal call diversion While external call diversion takes place in the network provider's local telephone exchange, internal call diversion is implemented by your telephone. Your telephone diverts the call via the second line of your ISDN connection. This means both phone lines are engaged for the duration of the call. You pay the charges for the connection to the forwarding number. However, you save yourself the network provider's charges for this function. Call forwarding CF CF, Call Forwarding. You want to forward calls to another number permanently. You can divert calls externally via the exchange or internally in the device itself. Call diversion (call forwarding) can be set up individually for each separate phone number (MSN) (to your mobile phone when on holiday, to the office, to a neighbour etc.). This is carried out at the network provider's local exchange. This means the call never reaches the original destination. There are three types of call diversion: immediate (CFU, Call Forwarding Unconditional), when busy (CFB, Call Forwarding Busy) and on no answer (CFNR, Call Forwarding No Reply). Call forwarding during the call phase CD, Call Deflection. Must be explicitly enabled by the network provider for each ISDN connection. CD enables an incoming call to be forwarded to any phone number while it is ringing, without having to answer the call. Because the caller has no affect on where it is forwarded (for example, to a mobile phone), you will pay the resulting charges. The caller must only pay the normal telephone charges to the connection he dialled. Call transfer (e.g., for ISDN PABX's) ECT, Explicit Call Transfer. User A calls User B. He puts the connection on hold and calls User C. Rather than connect everyone in a three-party conference, A now transfers User B to C and hangs up. Call waiting CW, Call Waiting. Service provided by the network provider. An acoustic signal during a call indicates that another caller is waiting. In addition, ISDN phones indicate this with a displayed message. You can then decide whether to accept or reject the second call. Call waiting protection Deactivates the call waiting signal. Callback on busy Callback must first be activated on the caller's terminal. A connection is established automatically as soon as the destination phone is no longer busy. As soon as the connection is free the caller is rung back. As soon as the caller lifts his receiver the connection is made automatically.