Versions Compared

Old Version 4

changes.mady.by.user Ribbon Communications

Saved on

compared with

New Version 5

changes.mady.by.user Ribbon Communications

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

Add_workflow_for_techpubs
AUTH2bscoggins
AUTH1bgoswami
REV5mshanmugam
REV6hprasad
REV3mcourtney
REV1kconger

Panel

In this section:

Table of Contents

Info
iconfalse

Related articles:

 

The

Spacevars
0series4
 provides a wide range of high density digital signal processor (DSP) modules and a comprehensive set of converged, voice, video, vocoder, fax and data media processing functions. This section provides guidance regarding when it is necessary to use DSPs on
Spacevars
0series
 devices (5100, 5110, 5200, 5210, 5400) and the
Spacevars
0series2
 device according to protocol usage.

Applications/Features Requiring DSPs

DSPs are required for the following features. For licensing details, refer to "SBC Protocol Licenses" section on the page Managing SBC Node-Locked Licenses for HW and SWe SBCs.

Caption
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
titleNote

Refer to See Supported Codecs and Transcoding for codec details.

Show If
matchall
groupconfluence-users

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

Hide If
matchall
groupconfluence-users

See Refer to 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
Infonote
titleNote

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
titleNote

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

Applications/Features not Requiring DSPs

DSPs are not required for the following features:

  • RFC 2833/4733 to OOB interworking

  • SRTP

  • RTCP (although RTCP termination is only recommended for transcoded calls)

  • Media policing

  • Signaling (Call and Registration) traffic policing

  • NAT traversal including ICE

  • RFC 2833/4733 based dial string applications

  • G.711 announcements

 

Pagebreak