Aastra Telecom 41-001286-00 manual Issue Causes Solution There is no audio when I make

Issue (Continued)	Causes (Continued)	Solution (Continued)
There is no audio when I make	The router blocks audio.	Use port forwarding. Check your router’s
Internet calls.		user manual to see how to configure port
		forwarding.
I cannot make landline calls.	The landline cable is not connected.	Check that the landline cable between
		the Line port on the MBU and the
		telephone wall outlet is connected
		properly.
	The landline is out of order.	Contact your landline provider.
I cannot receive landline calls.	The country setting is wrong.	Check that you have chosen the country
		that you are in. Open the System
		settings menu, choose Country
		selection, and then choose the country
		that you are in.
I cannot make Internet calls, the	The configuration of the phone is	Check that you have configured your
VoIP indicator on the MBU is not	not complete.	phone properly. See Configuring Your
lit, and the right status indicator		Phone for First-Time Use on page 22.
in the upper left corner of the		For more information, contact your
display is black.		Internet Telephony Service Provider or
		your System Administrator.
	The MBU has not been reset after	Reset the MBU and allow the MBU 2
	you saved the configuration.	minutes to log in at your Internet
		Telephony Service Provider.
	The router uses port forwarding.	Check that you have configured your
		router so that it always assigns the same
		IP address to your phone’s MAC address
		when using port forwarding. Otherwise
		incoming traffic is probably not forwarded
		to your phone. For more information,
		check your router’s manual.
	The router blocks Internet	Use port forwarding. The default SIP port
	telephony.	is 5060, and the default RTP port is
		5004. Ensure that your router always
		assigns the same IP address to your
		phone when using port forwarding.
		For more information, check your
		router’s manual.
	The router firmware needs updating.	Check your router’s user manual to see
		how to update the firmware.
When I make Internet calls, the	There is too much simultaneous	a) Reduce the amount of traffic on your
sound quality is poor.	data traffic on your broadband	broadband connection.
	connection.	b) Sign up for a Quality of Service	Troubleshooting
		agreement with your broadband
		provider.
		c) Order a connection with higher speed
		from your broadband provider.
	Your Internet Telephony Service	Contact your Internet Telephony Service
	Provider’s Quality of Service is	Provider regarding ensured voice
	based on a “best efforts” rather than	prioritization across the network.
	a guaranteed voice priority method.

Aastra MBU 400 User Guide 63