To determine if "Silence Suppression" is activated:
~>sip_route -print -profile Default | grep MediaSendCN
MediaSendCN: yes
Surprised to see it is set to yes? So was I. Documentation regarding the MGU pointedly states that VAD/CNG (Voice Activity Detection / Comfort Noise Generation) negatively impacts voice quality, but does improve DSP resource usage.
To fix:
1. Edit the appropriate profile to "no"
2. Restart SIPLP
3. sip_route -print -profile Default | grep MediaSendCN
An alternative is to edit VARC parameter D7, but the recommendation is editing the sip trunk profile.
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