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Stun, Static ip address, A server on t – Siemens GIGASET C475 IP User Manual

Page 200: See sip provider, On the subnet mask, the, See sip port/local sip port, Nd server in

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199

Glossary

Gigaset C470-475 IP / EN for IM-Ost / A31008-xxxx-xxxx-x-xxxx / glossary.fm / 18.12.07

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Server

Provides a service to other Network subscribers (Clients). The term can indicate a com-

puter/PC or an application. A server is addressed via IP address/Domain name and Port.

SIP (Session Initiation Protocol)

Signalling protocol independent of voice communication. Used for establishing and

ending a call. It is also possible to define parameters for voice transmission.

SIP address

See URI.

SIP port/Local SIP port

(Local) Port which is used to send and receive SIP signalling data for VoIP.

SIP provider

See VoIP provider.

SIP proxy server

IP address of your VoIP provider's gateway server.

Static IP address

A static IP address is assigned to a network component manually during network con-

figuration. Unlike a Dynamic IP address a static (fixed) IP address never changes.

STUN

Simple Transversal of UDP over NAT

NAT control mechanism.
STUN is a data protocol for VoIP telephones. STUN replaces the private IP address in the

data packets of the VoIP telephone with the public address of the secure private net-

work. To control data transfer, a STUN server is also required on the Internet. STUN can-

not be implemented with symmetric NATs.
See also: ALG, Firewall, NAT, Outbound proxy.

Subnet

Segment of a Network.

Subnet mask

IP addresses consist of a fixed line number and a variable subscriber number. The net-

work number is identical for all Network subscriberss. The proportion of the IP address

made up of the network number is determined in the subnet mask. In the subnet mask

255.255.255.0, for e.g., the first three parts of the IP address are the network number

and the last part the subscriber number.

Symmetric NAT

A symmetric NAT assigns different external IP addresses and port numbers to the same

internal IP addresses and port numbers – depending on the external target address.

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