Network; Sip Settings - Gigaset T300 PRO Administrator's Manual

Network

Please note
After making changes in this tab, it is necessary to restart the server.
This tab provides an overview of the configurations entered during initial installation,
which can be modified here.

SIP settings

SIP (Session Initiation Protocol) is an open network protocol standard for establishing
connections between two or more SIP-capable VoIP end devices. A key SIP property is the
usage of RTP (Realtime Transport Protocol). RTP "packets" the connection's audio and
video data and sends it via UDP (User Datagram Protocol). As port assignment with UDP
is dynamic, routers using NAT will not be able to assign the data packets to the corre-
sponding ports. If the server is in a network that uses NAT, e.g., via a router, you must acti-
vate the NAT checkbox.
Important
The following ports in the firewall must be enabled for using external end devices:
u
5060 UDP and 10000-20000 UDP for SIP clients
u
4569 UDP for IAX-Clients
NAT (Network Address Translation) "masks" the individual internal IP addresses "to the
outside" (to the Internet) using one or more public IP addresses. Port masquerading, as
this is known, is also frequently used to replace the port numbers during data transfer.
The NAT settings must be considered when the Gigaset T300 PRO / Gigaset T500 PRO
server is linked via a provider connection and/or external phones are connected (see also
Advanced settings
The interaction of Gigaset T300 PRO / Gigaset T500 PRO and NAT is very dependent on
the network architecture, and the settings should not be changed on a functioning sys-
tem (telephony to be precise). Conversely, the cause of non-functioning connections may
be found in the interaction of firewalls, routers and server.
A more in-depth explanation about NAT and its interaction with VoIP can be found at:
www.voip-info.org
External address
The External address field is particularly important: both the server for instant messaging
and the Gigaset T300 PRO / Gigaset T500 PRO WinClient access this entry. With the help
of the corresponding button on the right, the server's automatically detected address can
be copied into this field. Nevertheless, you can also use the public domain name for your
Gigaset T300 PRO / Gigaset T500 PRO server. In the event of Gigaset T300 PRO / Gigaset
T500 PRO being masked by NAT, resulting in problems with the external address, the fol-
lowing STUN field can help.
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