Operating instructions

Appendix
101
Problem Possible cause Solution / recommendation
Call forwarding cannot be
initiated
Missing or wrong settings for
the call forwarding function.
Telecommunications provider
or telephone system do not
support this function or the
function is not released.
Take out the setting or check
and change them if necessary.
Ask your telecommunications
provider or your telephone
system manufacturer whether
the function is possible or
needs to be released.
No telephone number is being
displayed for an incoming call
Your telecommunications
provider or telephone system
do not support this function or
the function is not released.
The caller has restricted the
presentation of his telephone
number.
The call comes from a public
telephone.
The call comes via a telephone
network that does not support
the transfer of the caller's
telephone number.
Ask your telecommunications
provider or your telephone
system manufacturer whether
the function is possible or
needs to be released.