The validation is based on the GCF Work Item GCF WI-221, "Voice over LTE (VoLTE) Quality and these test cases are now mandatory for devices, which support release 12 and wideband.
The UMTS wideband tests for Handheld handsfree (GCF WI-196) are validated as well as all other test cases (GCF WI-157) which are mandatory and necessary with the new requirements of release 12.
"The validations round up the audio testing services CETECOM is offering", Wilfried Klassmann, CEO of CETECOM, mentions. "Because of these validations, CETECOM is the sole laboratory globally which offers the full scope of audio testing for mobile devices."