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