Table Of Contents
DSP-Based Functionality on the Cisco UBE (Enterprise) Including Transcoding and Transrating
DSP-Based Functionality on the Cisco UBE (Enterprise) Including Transcoding and Transrating
The DSP-Based Functionality on the Cisco UBE (Enterprise) Including Transcoding and Transrating of dspfarm feature provides transcoding support for DSPs that are located on the same box as the Cisco ASR.
Contents
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How to Configure DSP-Based Functionality on the Cisco UBE (Enterprise) Including Transcoding and Transrating (Required)
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Verifying DSP Farm Configuration (Optional)
Prerequisites
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To enable this feature, you must have Cisco IOS XE Release 3.2S or a later release installed and running on your Cisco ASR 1000 Series Router.
Restrictions
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Out-of-box transcoding is not supported.
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Cisco Unified Communications Manager transcoding is not supported.
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Transcoding calls are not check-pointed, when failover happens, these calls will not be persevered. The expected behavior is for the SPA card to reset the DSPs and start the firmware download.
Information About DSP-Based Functionality on the Cisco UBE (Enterprise) Including Transcoding and Transrating
To configure transcoding on the Cisco UBE it was required that architecture a Cisco Unified Communications Manager was required to setup the transcoding streams through SCCP protocol for both inbox and out-of-box transcoding. The result is a significant amount of overhead for the inbox transcoding case with SCCP messaging and additional 2 RTPSPI and VOIP RTP ports associated with the SCCP transcoding call leg. The DSP-based functionality feature avoids addition resource overhead for inbox transcoding by having DSMP streams setup via VOIP FPI by the SPI legs bypassing the requirement for SCCP client, SCCP server and RTPSPI streams for inbox transcoding. The transcoding conversion in the Cisco UBE (Enterprise) is completed in the Ucode library. The DSP farm profile guarantees the configured resources for the most complex codec that is configured.
DTMF interoperability for transcoding calls is supported for the following call flows:
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RFC2833 <--> OOB
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RFC2833 <--> RFC2833
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Inband Tone <--> RFC2833
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Note
Inband <--> OOB is not supported currently by the CUBE (Enterprise).
How to Configure DSP-Based Functionality on the Cisco UBE (Enterprise) Including Transcoding and Transrating
To configure DSP-Based Functionality on the Cisco UBE (Enterprise) Including Transcoding and Transrating perform the following steps:
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
dspfarm profile profile-identifier {conference | mtp | transcode}
4.
codec {codec-type | pass-through}
5.
maximum sessions number
6.
associate application {cube | sbc | sccp} profile-description-text
7.
no shutdown
8.
exit
DETAILED STEPSVerifying DSP Farm Configuration
To verify DSP-based functionality on Cisco UBE (Enterprise) including Transcoding and Transrating of dspfarm feature use the following commands:
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show voice dsp group — Displays the DSP resource allocation, the total number of credits, and number of credits and channels in use.
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show dspfarm dsp — Display the dsps allocated to the dspfarm.
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show dspfarm dsp stats — Displays statsistics for each dsp session.