Question

Users on a wireless voice VLAN report choppy, garbled audio during calls, while wired phones on the same site are unaffected. RTCP statistics on the affected phones show low packet loss (0.2%) but jitter values fluctuating between 60 ms and 120 ms. The QoS policy marks voice with EF (DSCP 46) end to end, and the WLAN has WMM enabled. Which action is the MOST likely to resolve the choppy audio for the wireless users?

Accepted Answer

Ensure the SSID maps voice traffic to the Platinum QoS profile / WMM Voice (AC_VO) access category and enable Call Admission Control on the WLAN

Answer

Change the RTP media marking from EF to AF41 so voice competes fairly with video traffic on the wireless medium

Answer

Increase the interdigit timeout on the phones so DTMF is buffered before the media stream opens

Answer

Disable RTCP on the affected phones to reduce control-plane overhead on the air interface