PacketShaper introduces click noise every five seconds into audio line with VoIP

Solution

Overview

When using VoIP conenctions through PacketShaper you hear a click noise every 5 seconds. This is not present when shaping is switched off.

Cause
Resolution

The PacketShaper sends latency probes every 5 seconds by default. Latency probe is used for VoIP latency calculation.  It can be disabled or adjusted in the Legacy UI under:

 

Setup -> system variables -> VoIP Metrics

 

Disabling this does not effect the voice quality.  Alternatively, you can run the command below to have Packetshaper discard the latency probe sent by other Packetshapers for latency calculation, so it won't be forwarded to the end host. The command is:

 

sys set latencyprobediscard 1

 

 

Workaround
Additional Information
Bug Number
InQuira Doc IdKB4891
Attachment

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