Enabling PCM pass-through

The following matrix shows the feature and hardware compatibility:

Hardware	PCM pass-through compatibility
MSR954 (JH296A/JH297A/JH298A/JH299A/JH373A)	No
MSR958 (JH300A/JH301A)	No
MSR1002-4/1003-8S	No
MSR2003	No
MSR2004-24/2004-48	No
MSR3012/3024/3044/3064	Yes (supported only on E&M interface modules.)
MSR4060/4080	Yes (supported only on E&M interface modules.)

This feature is supported only when G.711 A-Law is used. For this feature to take effect on a subcard, you must reboot the subcard. To check whether this feature takes effect, use the display device verbose command.

To enable PCM pass-through:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter voice view.	voice-setup	N/A
3. Enable PCM pass-through.	Centralized devices in standalone mode: pcm-passthrough subslot subslot-number Distributed devices in standalone mode/centralized devices in IRF mode: pcm-passthrough slot slot-number subslot subslot-number Distributed devices in IRF mode: pcm-passthrough chassis chassis-number slot slot-number subslot subslot-number	By default, PCM pass-through is disabled.

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