McDewey

Symptom - Hissing is more driven and constant than static. White noise is a term often associated with strong hissing. Pink noise is a less constant hissing noise and brown noise even less constant still. Cause - A common cause of hissing is VAD. Hissing Symptom Recording Control Recording without the Symptom Hissing Snippet Recording Symptom - Hissing with unintelligible voice is a driven white noise that overwhelms the voice, as shown in the next example. The white noise is constant. Cause - This problem is addressed in Cisco bug ID CSCea15121 (registered customers only) . It is heard for calls through an NM-2V/3275 that uses an AIM-VOICE-30 as a DSPfarm. Hissing with Unintelligible Voice Symptom Recording Hissing with Unintelligible Voice Snippet Recording Symptom - Hissing periods often occur between segments of speech rather than throughout the whole signal. Cause - A common cause is VAD. Hissing Periods Symptom Recording Hissing Periods Snippet Recording Hum Symptom - Hum is a buzzing noise of interference from an electromagnetic source. An example is the sound heard on a radio when a nearby mobile phone is about to be called or detecting a cell. Cause - This problem is often caused by an electromagnetic source or telephone cables run near power lines. Hum Symptom Recording Control Recording without the Symptom Hum Snippet Recording Popping Symptom - Popping is external sounds that are broader and less regular than clicking. This is similar to popping sounds that might be heard on a two-way radio. Cause - A common cause of this is a Cisco Unity NIC card problem that inserts extra popping sounds. Popping Symptom Recording Popping Snippet Recording