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[Archive] Interoperability issue between Ascom i62 VoIP handsets and WLC/WLA wireless products.

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Article ID: KB30764 KB Last Updated: 10 Oct 2020Version: 2.0
Summary:
 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.
Symptoms:
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
Solution:
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.
  1. 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

  2. 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>

  3. 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

  4. 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

  5. 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

  6. 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.



 
Modification History:
2020-10-10: Archived article.
 

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