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Cisco Bug: CSCuk44700 - Cracking noise on G.711a codec on VISM-PR

Last Modified

Feb 22, 2014

Products (1)

  • Cisco MGX 8800 Series Switches

Known Affected Releases

3.1(2)

Description (partial) 

Symptom:The user experience cracking noise in the voice path when voice come from 
 the "IP side" of the connection.
 Conditions:The VISM is used as a VoIP trunking gateway for an H.323 access
 network. When a call is made, it is noticed great degradation of the voice quality 
 in the direction H.323 -> PSTN, characterized by very low PESQ values (~1.7) and 
 cracking noise. In  the other direction, that is PSTH -> H.323 the voice quality is good (PESQ = 
 4.10).
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