This revised Recommendation provides audio performance requirements for wideband audio (7 kHz) hands-free telephones. Associated test methods for verifying wideband audio performance are contained in Annex A.
ITU-T P.341 SPANISH-2005 history
2005ITU-T P.341 SPANISH-2005 Transmission characteristics for wideband (150-7000 Hz) digital hands-free telephony terminals