Dtmf; In-Band Ringing; Preparation For Mobile Phone; Registration – Pairing - Porsche PCM Manual

6. Glossary

DTMF

DTMF (Dual Tone Multiple Frequency) is a method of
telephone signalling in which the user can transmit tones
from the keypad while making a call e.g. to operate a
voice mailbox or telephone menu system.

In-band Ringing

Some mobile phones are able to transfer their ringtone
to the vehicle via Bluetooth . When a call comes in,
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the PCM then rings with the tone set on the phone rather
than its own tone. In this case, the ringtone settings in
the PCM are not active. The ringtone can only be set via
the phone. The CDR-31 does not support this function.

Preparation for mobile phone

The preparation for mobile phone (in combination with
CDR-31 or PCM) is a typical Bluetooth
system based on the Bluetooth
(HFP). The Bluetooth preparation for mobile phone
®
supports the following functions in principle:
– Pairing a mobile phone with search from the car
or phone.
– Automatically connecting a paired device after
system startup.
– Basic phone functions (making, receiving and ending
calls).
– Hands-free capability via the in-car audio system.
– Status displays such as network name and signal
quality.
Since the range of functions varies greatly between
different mobile phones, please refer to the applicable
details for your vehicle equipment and mobile phone in
the mobile phone compatibility list at www.porsche.com.
hands-free
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Hands-Free Profile
®
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Register state
The register state refers to the current status of the
connection with a mobile phone network. The network
name is displayed if the phone is currently connected
with a mobile network (if the phone transfers this
information). Other possible states include 'network
search' or 'registration failed'.
Registration – Pairing
Before Bluetooth -enabled devices can be connected,
®
they require a one-off registration or 'pairing' process
that protects the security of each device. To begin this
process, one of the devices is set to search for other
visible Bluetooth devices within range. A list of visible
®
devices is then displayed (device class permitting). After
the required device has been selected, it is necessary to
enter the same numerical code or 'passkey' into both
devices. If the pairing is successful, the devices will now
be authorised to exchange data (either system or user
data, e.g. voice, audio or video) unless the pairing is
deleted on either device.
Signal strength
Signal strength is an indicator of the general reception
quality on the mobile phone at any given location. It does
not correspond to the actual sound quality experienced
on a call as the individual voice channels on a mobile
network cell can vary considerably in quality. The signal
strength is displayed on the PCM/CDR-31 whenever the
phone is connected to a network cell, provided the
telephone transmits this information.
SIM card
A SIM card (SIM – Subscriber Identity Module) is a
mandatory requirement to gain access to a GSM
network. In addition to network-specific information used
to authenticate the subscriber, a SIM card can be used
to carry user data, e.g. phone book contacts and SMS
text messages. The card is PIN-protected to prevent
unauthorised access to this data.