Ims Wlan To Cellular - Aastra AMC 4 User Manual

Sim-Switch-Number: [digits]
Advantage of SIM Switch
All of the services offered by the AMC are exclusively available for configured users.
However, some users might have several SIM cards, mostly for taking advantage of
lower tariffs in different countries. It is possible to configure up to ten cell phone (SIM
card) numbers per user, but only one at a time will be "active".
How it works
A call to SIM Switch number is placed and hung up immediately. This guarantees
that the call is free of charge since it is never really established. If the SIM Switch
request was unsuccessful, you will not be able to make calls from now on, since the
AMCC cannot authenticate you. Such a failure should not happen, unless your new
SIM number was configured incorrectly on the AMCC.
What to do if SIM Switch doesn't work
If Automatic Start is activated, and if the SIM card requires PIN activation, the
AMC won't detect the new SIM card until the AMC was restarted. Restart the
AMC to see if the problem persists.
Your previously used SIM card will continue to work, unless there is a problem
on the AMCC-side: Check if there is a temporary problem by reinserting the
former SIM card. If it does not work, the error is likely to be located at the
AMCC.
If repeated attempts to Activate SIM Cards fail and if the configured number
of the second SIM card is correct, the reason could be an improper Caller ID
sent from your new SIM card. In those cases the switch has to be conducted
manually on the AMCC.

12.1.3 IMS WLAN to Cellular

If signal strength of the Wi-Fi hotspot decreases to a point where the voice quality suf-
fers, the client hands over the call to the cellular network. With Android this "handover"
is done via IMS.
How it works
The IMS-Number is used by the AMC to communicate to the AMCC that a manual
handover from Wi-Fi to your cellular network is desired. It has to correspond to the
number configured for this purpose on the AMCC. The call will then be established via
this number.
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