Method for regulating a speech quality of a communication connection between a first communication device coupled with a vehicle and a second communication device, in the case of which the communication connection is regulated by using the following steps: a) transmitting a test sequence, which is played by means of an audio reproducing apparatus of the vehicle, to a server using a communication device belonging to the vehicle; b) determining on the part of the server at least one signal quality parameter of a signal coding the test sequence transmitted by means of the communication device belonging to the vehicle; c) transmitting the test sequence played by the audio reproducing apparatus comprised by the vehicle to the server using the first communication device; d) determining on the part of the server at least one signal quality parameter of a signal coding the test sequence transmitted by means of the first communication device; e) comparing by means of the server at least one signal quality parameter of the signal coding the test sequence transmitted by the communication device belonging to the vehicle with at least one signal quality parameter of the signal coding the test sequence transmitted by the first communication device; f) determining settings and/or signal processing methods for a hands-free speech device of the vehicle, wherein the settings and/or signal processing methods are selected on the basis of signal quality parameters of the test sequence transmitted by the communication device belonging to the vehicle and of the test sequence transmitted by the first communication device and/or on the basis of differences determined between the signal quality parameters of the test sequence transmitted by the communication device belonging to the vehicle and the signal quality parameters of the test sequence transmitted by the first communication device, in order to improve a speech quality of a signal to be transmitted by the first communication device to the second communication device and/or of a signal to be reproduced by the hands-free speech device; g) transmitting the determined settings and/or signal processing methods to the vehicle; h) setting the settings and/or signal processing methods at the hands-free speech device of the vehicle. a) transmitting a test sequence, which is played by means of an audio reproducing apparatus of the vehicle, to a server using a communication device belonging to the vehicle; b) determining on the part of the server at least one signal quality parameter of a signal coding the test sequence transmitted by means of the communication device belonging to the vehicle; c) transmitting the test sequence played by the audio reproducing apparatus comprised by the vehicle to the server using the first communication device; d) determining on the part of the server at least one signal quality parameter of a signal coding the test sequence transmitted by means of the first communication device; e) comparing by means of the server at least one signal quality parameter of the signal coding the test sequence transmitted by the communication device belonging to the vehicle with at least one signal quality parameter of the signal coding the test sequence transmitted by the first communication device; f) determining settings and/or signal processing methods for a hands-free speech device of the vehicle, wherein the settings and/or signal processing methods are selected on the basis of signal quality parameters of the test sequence transmitted by the communication device belonging to the vehicle and of the test sequence transmitted by the first communication device and/or on the basis of differences determined between the signal quality parameters of the test sequence transmitted by the communication device belonging to the vehicle and the signal quality parameters of the test sequence transmitted by the first communication device, in order to improve a speech quality of a signal to be transmitted by the first communication device to the second communication device and/or of a signal to be reproduced by the hands-free speech device; g) transmitting the determined settings and/or signal processing methods to the vehicle; h) setting the settings and/or signal processing methods at the hands-free speech device of the vehicle.