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One of my customer’s recently started having problems receiving inbound calls although outbound calls worked just fine. Long story short, one of the dsp’s needed to be reset. When I issued the ‘show voice dsp detailed’ command, the dspware version displayed all zero’s. After reseting the dsp, calls started working again.

To disable the dsp, use the following command in privileged exec mode.

router#test dsp device *pvdm slot* *dsp* remove

To re-enable the dsp, use the following command in privileged exec mode.

router#test dsp device *pvdm slot* *dsp* restore

To reset the dsp, use the following command in privileged exec mode.

router#test dsp device *pvdm slot* *dsp* reset

Other interesting dsp commands:

c2691#test voice driver
Enter VPM or HDV or ATM AIM or NM−HD−xx or HDV2 slot number : 1
HDV2 Debugging Section;
1 − FPGA Registers Read/Write
2 − TDM tests
3 − 5510 DSP test
4 − DSPRM test
5 − HDLC32 test
6 − Register location check
7 − Interrupt counters.
8 − Quit

c2691#test dsprm 1
Section:
1 − Query dsp resource and status
2 − Display voice port’s dsp channel status
3 − Print dsp data structure info
4 − Change dsprm test Flags
5 − Modify dsp−tdm connection
6 − Disable DSP Background Status Query
7 − Enable DSP Background Status Query
8 − Enable DSP control message history
9 − Disable DSP control message history
10 − show dsp version
11 − Show alarm stats
12 − Enable dsprm alarm monitor
13 − Disable dsprm alarm monitor
q − Quit

Related Sources:
DSP on NM-HDV2 Functionality Verification for 2600XM/2691/2800/3700/3800 Platforms

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