Q&A

Haven’t found the answer? Let us know!

 

Name: John A
Comment: Hi,
could you write something about VoLTE codecs? What codecs are mandatory for VoLTE?

Time: November 22, 2017 at 07:56

Answer:

Hi John,

thank you for the question. IR.92 has mandated AMR / AMR-WB codecs to be used for VoLTE. Other codecs may be also used in addition to the AMR codecs.

  • The UE must support the AMR, including all 8 modes and source rate controlled operations (3GPP TS 26.093). Moreover the UE has to be capable of operating with any subset of these eight codec modes.
  • The UE must support AMR-WB including all nine modes and source controlled rate operation (3GPP TS 26.193). Again the UE has to be capable of operating with any subset of these nine codec modes.
  • If the EVS codec is supported, then the EVS AMR-WB IO mode may be used as an alternative implementation of AMR-WB.
  • If super-wideband or fullband speech communication is offered, then the UE must support the EVS codec.

More info added into  VoLTE flows – close encounters.

Advertisements