FRITZ!Box 3390 Service - Knowledge Base

FRITZ!Box 3390 Service

Requirements for HD telephony

With HD (High Definition) telephony, you will experience natural sound quality during 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 requirements must be met:

  • All parties must conduct the call over the internet or an ISDN line. HD telephony can also be used when conducting internal calls. HD telephony cannot be used if one of the parties is conducting the call over an analog line.
  • All of the telephones, PBXs, and the telephony provider used for the call must support the speech codec G.722.