Aastra Telecom 41-001286-00 manual Issue Causes Solution Cannot make Internet calls, but it

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Issue (Continued)	Causes (Continued)	Solution (Continued)

I cannot make Internet calls, but it	The MBU is not logged in at the	Check that all cables are connected
worked yesterday.	Internet Telephony Service Provider.	properly, and check that power is turned
		on, and then reset the MBU.
	The router is turned off.	Turn on the router.

	The SIP server is down.	Contact your Internet Telephony Service
		Provider.
	The Internet connection is down.	Contact your broadband provider.

How do I determine the software	I need to know the software version	a) Press Volume-Up button on the left
version of my Handset?	currently installed on my MBU 400.	side of the registered 420d handset to
		display the system status.
		b) Scroll down to see the Version SW:
		xx.xx field.

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Contents MBU 400TM Page Table of Contents Table of ContentsManaging Calls Important Safety Instructions Important Safety InstructionsImportantes mesures de sécurité Software License Agreement Software License AgreementFCC Information FCC InformationUS Service Center Consumer InformationApplicable for Coin or Pay Phone Only Safety Information Safety InformationBattery Disposal Information For countries outside the European UnionPage About This Guide About This GuideDocumentation Features MBU FeaturesCall and Telephony Features IntroductionOther MBU Features Aastra 420d Handset FeaturesDisplay Audio Features Other Handset FeaturesInstallation and Setup RequirementsGetting Started Getting StartedMBU Gateway Registering the 420d Handset Call420d Handset Key Descriptions Keys Key DescriptionMBU 400 IP Address and System Status IP address of your phone systemStarted Configuring Your Phone for First-Time UseGetting Configuring the Phone Using the Handset Specify the Domain and the SIP proxyGetting Started Using the 420d Handset Using the 420d HandsetIdle Mode Options Handset Idle ScreenHandset Main Menu Main MenuUsing the Volume Control Using the SpeakerphoneChanging the Access Code Changing the PIN Code for VoIP SettingsLocking/Unlocking the Keypad Changing the Access Code on the Gateway Changing the Access Code on the HandsetEntering Text, Numbers, and Symbols Customizing Your PhoneCustomizing Your Phone Changing the Handset NameText Input Modes Input SymbolsInput Characters Setting Time and Date Automatic Time/Date SettingsSpecifying a Language on the Handset Reaching the Language List DirectlySetting Date Manually Setting Time ManuallyChanging Time Format Changing Date Format Changing Time ZoneSpecifying the Primary Line for Outgoing Calls Setting Daylight Saving Time DSTChoosing VoIP or Landline Changing the Display Contrast Specifying Call GroupsChoosing SIP Account Setting Call Waiting Setting Do Not DisturbSetting Audio Changing the Ringer Volume Resetting the HandsetChanging the Ringer Melody Changing the Message Tone Changing the Keypad SoundSetting Your Phone to Vibrate Enabling/Disabling Silent ModeChanging Advisory Tones Changing Emergency Line Settings Making and Answering Calls Making and Answering CallsVoIP Calls Making a VoIP Call over the InternetIntercom Calls Landline CallsMaking a Landline Call Calling from the Contacts List Making an Intercom CallCalling All Handsets Calling a Contact on the Primary LineCalling a Contact on a Secondary Line Calling from the Call LogCalling from the Call Log on the Primary Line Calling Using Redial Calling from the Call Log on a Secondary LineRedialing on a Primary Line Redialing on a Secondary LineCalling Using Speeddial Answering CallsAny Key Answer Mode Caller IDMaking Emergency Calls Handling Calls Handling CallsPlacing a Call on Hold Calling with a Call on HoldMuting/Unmuting a Call Swapping CallsConferencing Calls Transferring a CallTransferring Calls Transferring to another HandsetTransferring to a VoIP or Landline Transferring to a Contacts List NumberEnding Calls Managing Calls Managing CallsContacts List Adding a Contact Editing a ContactDeleting a Contact Changing the Default Number for a ContactDeleting All Contacts Groups of Contacts Creating a Speeddial for a ContactCreating a Contact Group Viewing Entries in the Call Log Call LogAdding a Contact to a Group Voicemail Additional Features Additional FeaturesResetting the MBU Manually Registering/De-registering a HandsetUpdating the MBU 400 System Firmware Changing Internet SettingsUpdating the Firmware Troubleshooting TroubleshootingIssue Causes Solution There is no audio when I make Issue Causes Solution Cannot make Internet calls, but it Limited Warranty Limited WarrantyWarranty Repair Services After Warranty ServicePage Any key answer mode Index SIP Page

Issue (Continued)

Causes (Continued)

Solution (Continued)

I cannot make Internet calls, but it

worked yesterday.

version of my Handset?