Handover between the access points

For the handover between the access points to function correctly, all the access points need to use the same SSID. It is preferable that a separate SSID is used for the voice communication.

In the case of networks with 802.11g and 802.11n (20 MHz), the radio channels must have a channel spacing of 5 channels. So, e. g., only channels 1, 6 and 11 can be assigned without an overlap.

With some VoWLAN telephones (e. g. Ascom), a channel plan (e. g. channel 1, 6, 11) can be entered to optimise the handover between the access points. This means that, when the WLAN signal is weak, the telephone only searches for a new access point on the channels in the channel plan. This method enables a rather quicker handover. It is just important that, when doing the configuration, the telephone's channel plan is the same as the channels used in the WLAN network.