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Cisco Bug: CSCut07229 - Hissing Noise on NIM-4FXO

Last Modified

Jul 24, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

37.3(3)DSP 37.3(4)DSP 37.3(5)DSP

Description (partial)

Hissing noise can be heard prominently on .sout.  The hissing noise is consistent while the called party is not yet answering then it comes in and out on the entire conversation. It can be heard most of the time when calling party is not talking. "No vad" and "no comfort noise" are configured on the voice port and VOIP dial-peer.  This was experienced by the customer on his environment and was replicated at Cisco lab. There is a POTS line connected to NIM-4FXO on a 4331.  DSP type, DM8147 and SP2700.

Platform - 
 cisco ISR4331/K9 (1RU) processor with 7831854K/6147K bytes of memory.
 System image file is "bootflash:isr4300-universalk9.03.13.01.S.154-3.S1-ext.SPA.bin"

Voice Card -
"NIM-4FXO Voice Analog Module"

DSP Type-
DM8147  DSPWare 37.3.4
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