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0Table
1Applications/Features Requiring DSPs
3Features Requiring DSPs

 

FeatureExamples
Codec interworking

DSPs are needed when applying codec interworking. Below are but a few examples.

  • G711 to G729
  • G722 to AMR-WB
  • T38 fax to G711

 

Info

See Supported Codecs and Transcoding for codec details.

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See DSP Channel Densities for SBC 5000 and 7000 Series for DSP density details.

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See DSP Channel Densities for SBC 5000 and 7000 Series for DSP density details.

Fax and Modem Tone detections

Fax or Modem Tone detection can trigger modifications to calls in following scenarios, for example.

  • Calls to T.38 pass-through
  • Calls to G.711 pass-through
  • G.711 to T.38 transcoded
Note

These modifications can also be triggered via re-INVITEs triggered by remote Gateways that detect the tones.

Interworking in-band DTMF to Out-Of-Band (OOB) or RFC 2833/4733 DTMF events 

Detecting in-band DTMF for dial string applications

 
When the basic codec is the same on both legs

DSPs are needed for:

  1. Packet Size interworking – 10 ms G.711 interworked to 20 ms G.711
  2. Silence Suppression interworking
  3. RFC 2833/4733 Payload conversion – G.729 with DTMF PT 101 interworked to G.729 with DTMF PT 102
  4. Codec-specific attribute interworking – interworking AMR-WB with mode-set 1, 2, 3 with AMR-WB using mode-set 2, 3, 4, 5.
  5. Interworking T.38 V0 to T.38 V3
  6. Codec payload type changes

Playing compressed announcements

 

Ringback tones

 
Packet Service Profile option 'transcode only'DSPs are needed when PSP Packet To Packet Control object is set to 'Transcode only'.
Info

The term "pass-through" refers to the case when the SBC relays the media end-to-end and no DSPs are used.

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