Hi everybody,
We are facing problems when enabling U-APSD on our Ascom i62 VoWifi Phones. When receiving a call and picking it up, then sometimes there is no incoming voice traffic for the first 1-2 seconds. We're using a 5520 WLC (8.2.151.0) and 2802 AP's. There is also a special SSID for VoWifi Clients where WMM and QoS is configured as described in the Interoperability Guides from Ascom. DTIM Period is set to 5. QoS is set to Platinum and WMM to “Required”. EDCA profile for 802.11b/g/n is set to "Voice Optimized" and low latency MAC is disabled. 802.1p Tag (Wired QoS Protocol) is set to 6 for Platinum QoS Profile.
Have you got any ideas what the issue could be?
thanks,
Marc
