Aastra Clearspan 6757i User Manual page 112

Problem
Why does my phone display
the "No Service" message?
How do I restart the IP
phone?
___________________________________________________________________________________________
CS 6757i IP PHONE USER GUIDE V3.2.2
CLEARSPAN® IS A REGISTERED TRADEMARK OF AASTRA TECHNOLOGIES LTD.
Possible Solution(s)
The phone displays the "No Service" message if the SIP
settings have not been set up correctly. You can still use the
phone but it is not registered with the Registrar. For more
information about registering your phone, see your system
administrator.
This setting is in the Options list. See Restart Phone.
AASTRA - 2788-003
PAGE 112 OF 116