Gigaset C530 IP Owner's Manual page 85

Directories
Calling a Gigaset.net participant
You can call a Gigaset.net participant directly via the Gigaset.net phonebook (see above) or via
their Gigaset net number:
¤
Enter the Gigaset.net number (including the #9) or
¤
Press the Talk key
Every number ending with #9 is dialled via Gigaset.net.
84
c
.
s
¤
select it from the local phonebook.