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

Last Modified

Sep 24, 2018

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

Related Community Discussions

Lot of noise on PSTN call (NIM-BRI)
HI,  I am having an issue with offnet call on ISR 4331. I can not hear the voice. there's only a lot of noise. please help me to fix this issue. attached show version and show run.   thank you in advance 
Latest activity: Mar 09, 2018
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