This article describes about the interoperability issue between Ascom i62 VoIP handsets and WLC/WLA wireless products, as well as the WLC configuration that can mitigate this issue.
WLAN VoIP users are experiencing one of the following symptoms when establishing or receiving a call on a Ascom i62 handset:
- A one-way voice call
- Connection is lost or dropped
- Choppy or noisy call
Please refer the following recommendations for your “Voice” SSID (Service Set Identifier).
For testing purposes, Juniper Networks implemented the following recommendations for an “Open” SSID on a MP-422B access point.
- Configure the QoS settings:
WLC# set qos dscp-to-cos-map 26 cos 4
WLC# set qos dscp-to-cos-map 46 cos 6
WLC# set qos cos-to-dscp-map 4 dscp 26
WLC# set qos cos-to-dscp-map 6 dscp 46
- Configure the security ACL and map it to the test service-profile:
WLC# set security acl hit-sample-rate 1
WLC# set security acl name <ARP_ASCOM> permit cos 6 mac 00:00:00:00:00:00 ff:ff:ff:ff:ff:ff 00:00:00:00:00:00 ff:ff:ff:ff:ff:ff ethertype 806 hits
WLC# set security acl name <ARP_ASCOM> permit mac 00:00:00:00:00:00 ff:ff:ff:ff:ff:ff 00:00:00:00:00:00 ff:ff:ff:ff:ff:ff ethertype any
WLC# commit security acl <ARP_ASCOM>
- Configure for “Open” SSID:
WLC# set service-profile Open ssid-name Open
WLC# set service-profile Open ssid-type clear
WLC# set service-profile Open proxy-arp enable
WLC# set service-profile Open no-broadcast enable
WLC# set service-profile Open short-retry-count 3
WLC# set service-profile Open long-retry-count 3
WLC# set service-profile Open auth-fallthru last-resort
WLC# set service-profile Open cac-mode session
WLC# set service-profile Open load-balancing-exempt enable
WLC# set service-profile Open 11n mode-na disable
WLC# set service-profile Open 11n mode-ng disable
WLC# set service-profile Open wpa-ie auth-dot1x disable
WLC# set service-profile Open rsn-ie auth-dot1x disable
WLC# set service-profile Open transmit-rates 11g mandatory 12.0 disabled 1.0,2.0,5.5,6.0,9.0,11.0 beacon-rate 12.0 multicast-rate AUTO
WLC# set service-profile Open transmit-rates 11a mandatory 12.0 disabled 6.0,9.0 beacon-rate 12.0 multicast-rate AUTO
WLC# set service-profile Open attr filter-id ARP_ASCOM.out
WLC# set service-profile Open attr filter-id ARP_ASCOM.in
WLC# set service-profile Open attr vlan-name voip
- Configure the radio-profile settings:
WLC# set radio-profile test
WLC# set radio-profile test dtim-interval 3
WLC# set radio-profile test rf-scanning mode passive
WLC# set radio-profile test rf-scanning channel-scope operating
WLC# set radio-profile test 11n channel-width-na 20MHz
WLC# set radio-profile test service-profile Open
WLC# set radio-profile test service-profile test
WLC# set radio-profile test rate-enforcement enable
- Map the radio-profile to one of the MP-422B access point and perform a test:
WLC# set ap <ap-num> serial-id xxxxxx model MP-422B
WLC# set ap <ap-num> name <ap-name>
WLC# set ap <ap-num> radio 1 radio-profile test mode enable
WLC# set ap <ap-num> radio 2 radio-profile test mode enable
WLC# set ap <ap-num> radio 2 load-balancing disable
- After implementing the above settings, connect the Ascom i62 phones to the “Open” SSID which is associated to the MP-422B access points. Verify the connection.
2020-10-10: Archived article.