Acer ISDN 128 Surf USB Bedienungsanleitung PDF herunterladen (Seite 8)

4 Simple solution of VoIP without especially HW for testing transmit of

voice over IP based network

Fig. 3 -Simple solution of VoIP on switched network with H.323 clients

The ground of this solutions is server with an ISDN modem card and Open source Asterisk

software. Asterisk provides all of the features you would expect from a PBX (Private Branch

Exchange) and more. Asterisk does voice over IP in protocols

(SIP and H.323), and can interoperate with almost all standards-based telephony equipment

using relatively inexpensive hardware. Clients use a software with a protocol H.323 like a MS-

Netmeeting or SIP protocol based clients like a Xlite, SjPhone. Clients are connected to

Ethernet switch over 802.11x Wireless Access point or direct on switch with Ethernet card

10/100Base-Tx.

5 Introduction to measuring of QoS parameters

For prosecution of Voice over Internet protocol (VoIP) we need network which execute

parameters Quality of Service (QoS). Because the IP networks are packets oriented without

construction of connection like in switched oriented network, where we have guaranteed

specific delay and bandwidth for services. In packet oriented networks we have not beforehand

specific delay and bandwidth etc.

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Acer ISDN 128 Surf USB Bedienungsanleitung Seite 8