Once this file is on the Flash, reload the router.
Note: The same DSPWare on the router Flash is loaded whenever the router is reloaded, even if the Cisco IOS image is upgraded. Remember to remove the .rbf file if bundled DSPWare within Cisco IOS is needed.
Some tracebacks can occur as the router boots. But, this does not seem to affect the operation. Issue theshow voice dsp command when the router is up in order to confirm that the DSP firmware runs.
If an NM-HDV2 module and DSPs are used on the motherboard as well, two files in the Flash are needed for the DSPWare upgrade.
The first file is already on the Flash and must be kept there so that the DSPs on the motherboard are upgraded. Rename that file based on the network module on which it sits.
For the NM-HDV2, make a copy of the dsp_c5510_flex.rbf file and rename the new file hdv2.dsp. Then, load it onto the Flash.
Reload the router, so it upgrades the DSPs on both the motherboard and the NM-HDV2.
Cisco bug ID CSCsb68986 documents the same issue for Cisco IOS gateways that run Cisco IOS Software Release 12.3T, which can experience brief convergence echo at the start of a call when connected to high ERL PSTN loops. There is no known workaround for this issue other than to reduce the PSTN ERL which is not usually under one's control. This issue is fixed in these software releases:
Cisco IOS Software Release 12.4(3e) and later
DSP 4.4.24 and later
In order to obtain the appropriate DSPWare version, open a service request with Cisco Technical Support through the TAC Service Request Tool.
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