Teldat bintec RT1202 Manuel d'utilisateur télécharger pdf (Page 412)

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Chapter 20 VoIP

Voice over IP (VoIP) uses the IP protocol for voice and video transmission.

The main difference compared with conventional telephony is that the voice information is

not transmitted over a switched connection in a telephone network, but divided into data

packets by the Internet protocol and these packets are then passed to the destination over

undefined paths in a network. This technology uses the existing network infrastructure for

voice transmission and shares this with other communication services.

The Session Initiation Protocol (SIP) is used to establish, clear and control a communica-

tion session.

20.1 Application Level Gateway

To enable IP telephones to connect by SIP to a VoIP Provider your device has an Applica-

tion Level Gateway (ALG), i.e. an appropriate proxy that implements the necessary NAPT

and firewall releases.

Note

The Application Level Gateway must always be used if NAT is enabled on the inter-

face that makes the connection to the Internet.

20.1.1 SIP Proxies

Here you can view a list of application level gateway entries that have already been con-

figured. These entries enable the ALG. Each entry defines a particular TCP or UDP destin-

ation port that is to be supervised by the ALG. In the ex works state, there are two entries

configured for the SIP Ports TCP 5060 and UDP 5060 in accordance with the IANA defini-

tion.

20 VoIP Teldat GmbH

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