7
Wireless use of Gigaset SL75 WLAN – VoIP
Gigaset SL75 WLAN / en / A31008-M700-B112-1-7619 / starting.fm / 24.4.06
Ve
rs
ion05.
08.2
005
Introduction: making calls with VoIP
With VoIP (
V
oice
o
ver
I
nternet
P
rotocol),
your calls are no longer made via a fixed
connection as in the telephone network,
but rather they are transmitted via the
Internet in the form of data packets.
In order to establish connections to other
subscribers, the handset uses the SIP
standard (
S
ession
I
nitiation
P
rotocol). SIP
controls call setup and disconnection. The
actual voice data is transmitted with RTP
(
R
ealtime
T
ransport
P
rotocol).
To be able to use VoIP, you need the fol-
lowing:
u
Access to a local, wireless network
(WLAN =
W
ireless
L
ocal
A
rea
N
etwork)
with a central structure (infrastructure
WLAN), which supports WLAN stand-
ard
IEEE 802.11g
or
IEEE 802.11b
and
has a connection to the Internet.
Access to the WLAN is enabled by
access points (e.g. WLAN routers or
public hotspots).
Requirements:
– The access point does not require a
Web browser on the handset for
login.
– The access point is in "keep alive"
status and is thus permanently
online.
– You should have agreed a flat rate or
a volume-based tariff with your
Internet service provider.
u
Access to the services of a SIP or gate-
way provider. Open an account with a
VoIP provider who supports the SIP
standard (SIP provider).
With your handset, you can use all the
advantages of VoIP:
u
Via a broadband Internet access
(e.g. DSL), you can make cost-effective,
high-quality voice calls via the Internet
at a flat rate or volume-based price.
u
Your SIP provider will give you a per-
sonal number or address with which
you can be reached worldwide from
the Internet, the fixed network and any
mobile communications network.
u
You can use your handset to make calls
anywhere and you yourself can be
reached anywhere under your personal
number – at home, in the office, or
when on the move – without needing
to switch on your PC.
Saving configuration in access profiles
The settings that are required for login to
different WLANs or under different SIP
accounts can be saved on the handset in
up to 16 access profiles. If you then wish
to use your handset in the office instead of
at home, you simply need to activate the
appropriate access profile.
You can create and edit the access profiles
directly on the handset (page 59) or on
your PC via the Web configurator
(page 90).
Below, there is a general description of the
individual WLAN and SIP components that
you must specify in an access profile.
