FRITZ!Fon C5 Service - Knowledge base

FRITZ!Fon C5 Service

Prerequisites for HD telephony

HD (High Definition) telephony offers new, natural sound quality when conducting calls. When using HD technology to make a call, the full frequency spectrum of speech is transmitted, resulting in realistic voice reproduction. To conduct calls in HD quality, the following prerequisites must be met:

  • Both parties must either use internet telephony (VoIP) or an ISDN line to conduct the call. HD telephony can also be used when conducting internal calls. HD telephony cannot be used if one of the parties is using an analog landline.
  • All telephones, PBXs, and the telephony provider used for the call must support the speech codec G.722. Cordless telephones must also support HD telephony.

    Note:All current FRITZ!Fon models support HD telephony and G.722. If you are using a telephone from a different manufacturer, the manufacturer can tell you whether it supports HD telephony and G.722.