Calling (Windows Configuration Designer reference)

Use to configure settings for Calling.


These settings are intended to be used only by manufacturers, mobile operators, and solution providers when configuring devices, and are not intended for use by administrators in the enterprise.

Applies to

Setting groups Desktop editions Mobile editions Surface Hub HoloLens IoT Core
All settings X


See Branding for phone calls.


Enter a GEOID, select Add, and then enter the number of digits for matching caller ID.

For a list of GEOID codes and default number of digits for each country/region, see Overriding the OS default minimu number of digits for caller ID matching.


See Cause codes.


CDMA Heuristics (on by default) makes CDMA calling more user-friendly by exposing an interface that supports multiple calls with call waiting, swapping, and three-way calling.

For CDMAPriorityCallPrefix, enter a custom call prefix that would allow the user to override an ongoing call with a remote party mostly used in emergency services and law enforcement.

Set DisableCdmaHeuristics to True to disable the built-in heuristics.


See Dialer codes to launch diagnostic applications.


Use to configure settings for each subscriber identification module (SIM) card. Enter the Integrated Circuit Card Identifier (ICCID) for the SIM card, select Add, and then configure the following settings.


Setting Description
MOSimFallbackVoicemailNumber Partners who do not have the voicemail numbers on the device SIM can configure the voicemail number for their devices. If the voicemail number is not on the SIM and the registry key is not set, the default voicemail will not be set and the user will need to set the number. Set MOSimFallbackVoicemailNumber to the voicemail number that you want to use for the phone.
SimOverrideVoicemailNumber Mobile operators can override the voicemail number on the UICC with a different voicemail number that is configured in the registry. Set SimOverrideVoicemailNumber to a string that contains the digits of the voicemail number to use instead of the voicemail number on the UICC.


Setting Description
AllowMixedAudioVideoConferencing Set as True to enable audio and video calls in the same conference.
AllowVideoConferencing Set as True to enable the ability to conference video calls.
AutoDismissUssedWaitingDialog Set as True to enable automatic dismissal of "Waiting" dialog on USSD session termination.
CallerIdBlockingPrefixList Enter a list of prefixes which will not see the caller ID. Use a semicolon (;) as a delimiter.
DefaultCallerIdSetting Configure the default setting for caller ID. Select between No one, Only contacts, Every one, and Network default. If set to Network default, set ShowCallerIdNetworkDefaultSetting to True.
DefaultEnableVideoCalling Set as True to enable LTE video calling as the default setting.
DefaultEnableVideoCapability Set as True to enable LTE video capability sharing as the default setting.
EnableSupplementaryServiceEraseToDeactivateOverride Enables conversion of supplementary service erase commands to deactivate commands.
IgnoreCallerIdBlockingPrefix DO NOT USE
IgnoreMWINotifications Set as True to configure the voicemail system so the phone ignores message waiting indicator (MWI) notifications.
IgnoreProhibitedDialingPrefix Ignore prohibited dialing prefix. An OEM/MO can specify a certain set of strings by region that when dialed will block a user's caller ID from being displayed on the device receiving the call. The list is separated by semicolon. This setting does not apply beyond Windows 10, version 1709.
IgnoreUssdExclusions Set as True to ignore Unstructured Supplementary Service Data (USSD) exclusions.
ProhibitedDialingPrefixList A semicolon delimited list of previxes that are prohibited from being dialed.
ResetCallForwarding When set to True, user is provided with an option to retry call forwarding settings query.
ShowCallerIdNetworkDefaultSetting Indicates whether the network default setting can be allowed for outgoing caller ID.
ShowVideoCallingSwitch Use to specify whether to show the video capability sharing switch on the mobile device's Settings screen.
ShowVideoCapabilitySwitch Configure the phone settings to show the video capability sharing switch.
SupressVideoCallingChargesDialog Configure the phone settings CPL to suppress the video calling charges dialog.
UssdExclusionList List used to exclude predefined USSD entries, allowing the number to be sent as standard DTMF tones instead. Set UssdExclusionList to the list of desired exclusions, separated by semicolons. For example, setting the value to 66;330 will override 66 and 330. Leading zeros are specified by using F. For example, to override code 079, set the value to F79. If you set UssdExclusionList, you must set IgnoreUssdExclusions as well. Otherwise, the list will be ignored. See List of USSD codes for values.
WiFiCallingOperatorName Enter the operator name to be shown when the phone is using WiFi calling. If you don't set a value for WiFiCallingOperatorName, the device will always display SIMServiceProviderName Wi-Fi, where SIMServiceProviderName is a string that corresponds to the SPN for the SIM on the device. If the service provider name in the SIM is not set, only Wi-Fi will be displayed.


To customize call progress branding when a call is made using a specific audio codec, select the audio codec from the dropdown menu and select Add. Select the codec in Available Customizations and then enter a text string (up to 10 characters) to be used for call progress branding for calls using that codec. For more information, see Use HD audio codec for call branding.


These are Verizon/Sprint-only settings to allow the operator to send an OMA-DM update to the device with the given alert characteristics, which are defined between the mobile operator and OEM, which in turn will inform the device to turn on or off IMS.


See Dial string overrides when roaming.


Setting Description
AdjustCDMACallTime Change the calculation of CDMA call duration to exclude the time before the call connects.
AssistedDialSetting Turn off the international assist feature that helps users with the country codes needed for dialing international phone numbers.
CallIDMatch Sets the number of digits that the OS will try to match against contacts for Caller ID. For any country/region that doesn't exist in the default mapping table, mobile operators can use this legacy CallIDMatch setting to specify the minimum number of digits to use for matching caller ID.
CallRecordingOff Indicates if call recording is turned off. Users will not see the call recording functionality when this is set to True.
ConferenceCallMaximumPartyCount Enter a number to limit the number of parties that can participate in a conference call.
ContinuousDTMFEnabled Enable DTMF tone duration for as long as the user presses a dialpad key.
DisableVideoUpgradeStoreNavigation If there are no compatible video upgrade apps installed, tapping the video upgrade button will launch a dialog that will navigate to the Microsoft Store. If this option is enabled, it will show a dialog that informs the user that no video app is installed, but it will not navigate to the Microsoft Store.
DisableVoicemailPhoneNumberDisplay Disable the display of the voicemail phone number below the Voicemail label in call progress dialog.
DisplayNoDataMessageDuringCall Display a message to the user indicating that there is no Internet connectivity during a phone call.
DisplayNumberAsDialed Display the outgoing number "as dialed" rather than "as connected".
EnableVideoCalling Set to True to enable video calling.
HideCallForwarding Partners can hide the user option to turn on call forwarding. By default, users can decide whether to turn on call forwarding. Partners can hide this user option so that call forwarding is permanently disabled.
HideSIMSecurityUI Hide the SIM Security panel from phone Settings.
LowVideoQualityTimeout Configure the phone timer to automatically drop video when the quality is low, in milliseconds.
MinTimeBetweenCallSwaps Configure how often the user can swap between two active phone calls, in milliseconds.
PromptVideoCallingCharges Prompt user for charges associated with video calls.
ShowLongTones Partners can make a user option visible that makes it possible to toggle between short and long DTMF tones, instead of the default continuous tones. By default, the phone supports Dual-Tone Multi-frequency (DTMF) with continuous tones. Partners can make a user option visible that makes it possible to toggle between short and long tones instead.
UseOKForUssdDialogs OEMs can change the button label in USSD dialogs from Close (the default) to OK.
UseVoiceDomainForEmergencyCallBranding Use voice domain to decide whether to use Emergency calls only or No service in branding.
VideoCallingChargesMessage Enter text for the message informing the user about the charges associated with video calls.
VideoCallingChargesTitle Enter text for the title of the dialog informing the user about the charges associated with video calls.
VideoCallingDescription Enter text to describe the video calling feature.
VideoCallingLabel Enter text to describe the video calling toggle.
VideoCapabilityDescription Enter text to describe the video capability feature.
VideoCapabilityLabel Enter text to describe the video capability toggle.
VideoTransitionTimeout Enter the time in milliseconds to check how long the video transition state will remain until the remote party responds. The minimum value is 10000 and the maximum value is 30000.
VoLTEAudioQualityString Partners can add a string to the call progress screen to indicate if the active call is a high quality voice over LTE (VoLTE). Set the value of VoLTEAudioQualityString to the string that you want to display in the call progress screen to indicate that the call is a VoLTE call. This string is combined with the PLMN so if the string is "VoLTE", the resulting string is "PLMN_String VoLTE". For example, the string displayed in the call progress screen can be "Litware VoLTE" if the PLMN_String is "Litware". The value you specify for VoLTEAudioQualityString must exceed 10 characters.


Setting Description
EnableSoftwareProximitySensorMitigation Enable software proximity sensor mitigation.


Setting Description
AppId Enter the app ID for your phone call/SMS filter application.


See Dialer codes for supplementary services.


Configure these settings to customize visual voicemail in the Windows 10 Mobile UI. For settings and values, see Visual voicemail.

List of USSD codes

Codes Description DWORD Value
04 CHANGEPIN 000000F4
042 CHANGEPIN2 00000F42
05 UNBLOCKPIN 000000F5
052 UNBLOCKPIN2 00000F52
75 EMLPPBASE 00000075
750 EMLPPLEVEL0 00000750
751 EMLPPLEVEL1 00000751
752 EMLPPLEVEL2 00000752
753 EMLPPLEVEL3 00000753
754 EMLPPLEVEL4 00000754
66 CALLDEFLECT 00000066
30 CALLIDCLIP 00000030
31 CALLIDCLIR 00000031
76 CALLIDCOLP 00000076
77 CALLIDCOLR 00000077
67 FWDBUSY 00000067
61 FWDNOREPLY 00000061
002 FWDALL 00000FF2
43 CALLWAITING 00000043
360 UUSALL 00000360
361 UUSSERVICE1 00000361
362 UUSSERVICE2 00000362
363 UUSSERVICE3 00000363
33 BARROUT 00000033
331 BARROUTINTL 00000331
35 BARRIN 00000035
351 BARRINROAM 00000351
330 BARRALL 00000330
333 BARRALLOUT 00000333
353 BARRALLIN 00000353
96 CALLTRANSFER 00000096
070 PNP0 00000F70
071 PNP1 00000F71
072 PNP2 00000F72
073 PNP3 00000F73
074 PNP4 00000F74
075 PNP5 00000F75
076 PNP6 00000F76
077 PNP7 00000F77
078 PNP8 00000F78
079 PNP9 00000F79
300 CALLCNAP 00000300
591 MSP1 00000591
592 MSP2 00000592
593 MSP3 00000593
594 MSP4 00000594