Telephone, basic function

Overview

This document contains the following information:

 Telephony

 Overview of functional scope of telephony

 Bluetooth® coupling

 Telephony via the telephone control unit

 Two phone mode

 Car antenna connection

 Messaging (SMS)

 Contacts

 Ring tone

 Manual telephone favorites

 Relationships

General

The telephone function makes it possible to establish telephone connections in the vehicle. The telephone function is operated via the multimedia system's display and control elements, the buttons on the multifunction steering wheel or via the mobile phone. The telephone calls are conducted via the hands-free system and the speaker system. Here, it is primarily the speakers in front area of the vehicle that are actuated.

In some markets, the multimedia system can also optionally use mobile network connections for data transfer in the Internet function. The connected devices can also be used for music playback.

Telephony

To establish a telephone connection in the vehicle, there are the following options:

 Via a mobile phone connected to smartphone integration

 Via the telephone control unit with an integrated SIM card

 Via a mobile phone coupled with Bluetooth®

 Telephony in the rear (separately described subsystem)

 Irrespective of the telephony in the rear, telephony can also be operated from the rear passenger compartment on vehicles with Rear Seat Entertainment System or tablet PC.

The telephone function supports the following functions:

 Establish telephone connection.

 Disconnect telephone connection.

 Accept incoming call.

 Reject incoming call.

 Toggle calls (for switching between two connections).

 Join conference call.

 Transfer telephone call to mobile phone.

If there is an active telephone connection, the multimedia system switches the current audio source to mute.

 Active telephone connections are interrupted in the event of an emergency call.

Overview of functional scope of telephony

The following functions are supported:

 Bluetooth® connection

 Two phone mode

 Messaging (SMS)

Bluetooth® coupling

Additional function requirements:

 Mobile phone with hands-free profile (HFP) 1.0 or higher

 Bluetooth® on mobile phone activated

 Bluetooth® in multimedia system activated

A device is coupled via Bluetooth® in two steps:

 Authorize

 Connecting

The multimedia system can save authorizations for up to 15 mobile phones. Mobile phone authorization is only necessary once for each mobile phone. Exception: When authorizing a 16th device, authorization for the telephone not used for the longest time is deleted.

The multimedia system automatically reconnects authorized mobile phones. The multimedia system automatically searches for all authorized mobile phones and connects to the mobile phones in the sequence of the last used.

In two phone mode, the "second telephone" is also automatically reconnected. Bluetooth® audio equipment is also reconnected, provided that the current media source is Bluetooth® audio.

The user can also establish the connection to authorized mobile phones manually via the multimedia system.

Depending on the vehicle equipment, two mobile phones can be connected at the same time for making phone calls. An additional mobile phone can be connected via Bluetooth® for media mode.

On vehicles with mobile phone cradle, the following functions are possible via NFC (near-field communication):

 Authorizing a mobile phone

 Switching over the connected telephones

Telephony via the telephone control unit

The telephone control unit connects here as a Bluetooth® telephone to the multimedia system control. Telephony can be undertaken via the telephone control unit in the following operating modes:

 SIM card in telephone control unit: The telephone connection is made through the SIM card in the telephone control unit.

 SIM card in telephone control unit in combination with a mobile phone: As soon as the corresponding mobile phone is connected to the multimedia system in the vehicle, the SIM card in the control unit is automatically activated and then used for telephony. If the corresponding mobile phone is not connected, then telephony using the SIM card in the telephone control unit is not possible.

 SIM card in mobile phone through SAP (SIM Access Profile):

Here, the telephone control unit accesses the SIM card in the telephone through the SAP. As long as a mobile phone is connected through SAP, no calls can be made using the mobile phone, as its SIM card is "on loan" to the vehicle. The mobile phone must support the Bluetooth® SAP profile for this.

Two phone mode

It is possible to connect two mobile phones at the same time using two phone mode. During two phone mode, the full functional scope is operable via the multimedia system on the mobile phone selected as the "first telephone".

The following functions are operable via the multimedia system with the current "second telephone":

 Incoming calls

 Incoming messages (SMS)

The user can swap the "first telephone" and "second telephone" at any time using the multimedia system's control and display elements.

Car antenna connection

Depending on the equipment installed, the multimedia system receives and transmits the mobile phone signals via the vehicle's telephone antennas in the following situations:

 Telephony via the telephone control unit

 Telephony via mobile phone in front mobile phone cradle

Depending on the model and equipment installed, one or more antenna splitters or antenna changeover switches forward the antenna signals to the telephone control unit or to the mobile phone cradle control unit.

For mobile phone connection via the mobile phone cradle control unit, a cellular telephone system antenna amplifier/compensator also amplifies the antenna signals. The antenna signals are transferred between the mobile phone cradle and the mobile phone by a capacitive coupling.

Messaging (SMS)

The messaging function provides the following functions:

 Display of SMS messages in the media display

 Reading out of SMS messages

 Writing and sending of SMS messages (including dictation function and text templates)

 Deleting SMS messages

 Calling a telephone number in an SMS message and calling back the person who sent the SMS message

 Calling up a URL in an SMS message (depending on equipment)

The multimedia system uses the Bluetooth® "MAP" profile for communication.

The multimedia system limits the length of the text displayed while driving.

Contacts

The address book in the multimedia system shows the following contacts:

 Contacts stored in the multimedia system

 Contacts loaded from the mobile phone via Bluetooth®

There are the following options for adding contacts to the address book in the multimedia system:

 Importing via the Bluetooth® connection

 Importing via the USB device

The multimedia system supports the import of contacts in "vCard" format. If contact synchronization is switched on, then the multimedia system automatically imports the mobile phone's contacts.

Ring tone

If the mobile phone supports the transmission of the ringtone, the mobile phone ring tone is heard instead of the ring tone of the vehicle audio system.

Manual telephone favorites

For quick access, up to 15 favorites can be manually added in the telephone main menu of the multimedia system.

Relationships

The relationships function makes it possible to save the relationships of contacts to people ( e.g. nicknames). If voice control does not recognize a person ( e.g. "call my mom"), voice control will ask which contact the name should be assigned to. The relationship between the name and the contact is then stored in the multimedia system as a relationship.