A transcoder is a device that performs codec conversion, converting an input stream from one codec into an output stream that uses a different codec.
For example, a transcoder can take a G.711 stream and convert it to a G.729 stream in real time. When the two endpoints in a call use different voice codecs, Cisco Unified Communications Manager invokes a transcoder into the media path.
The transcoder converts the data streams between the two incompatible codecs so that communication can occur. The transcoder is invisible to either the user or the endpoints that are involved in a call.
Transcoder resources is managed by the Media Resource Manager (MRM).
Configure Transcoder in call manager:
Step 1: Log into Cisco Unified CM Administration and choose Media Resources > Transcoder.
Step 2: Click Find and select an existing transcoder. Click Add New.
Step 3: Select the Transcoder Type.
Step 4: Enter all the necessary fields.
Step 5: Assign a Device Pool from the drop-down menu.
Step 6: Click Save.
Add Transcoder to Media Resource Group
Step 1: Choose Media Resources > Media Resource Group.
Step 2: Click Find to display the list of configured Media Resource Groups.
Step 3: Click on the required Media Resource Group.The Media Resource Group Configuration window displays.
Step 4: Select the transcoder from the list of available media resources and add it to the Selected Media Resources list.
Step 5: Click Save.
Step 6: Navigate to Media Resources > Media Resource Group.
Step 7: In the Find and List Transcoders window, check the check boxes next to the transcoders that you want to synchronize. To choose all transcoders in the window, check the check box in the matching records title bar.
Step 8: Click Apply Config to Selected.The Apply Configuration Information dialog box displays and click OK.
Command to register in VG
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dspfarm profile 10 transcode
codec g729abr8
codec g729ar8
codec g711alaw
codec g711ulaw
codec pass-through
maximum sessions 20
associate application SCCP
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sccp ccm group 999
associate ccm 1 priority 1
associate ccm 2 priority 2
associate ccm 3 priority 3
associate profile 10 register Chola-xcode-vg1
keepalive retries 5
switchover method immediate
switchback method immediate
switchback interval 15
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