Acer ISDN 128 Surf USB Bedienungsanleitung PDF herunterladen (Seite 17)

interoperate with almost all standards-based telephony equipment using relatively inexpensive

hardware.

Asterisk provides Voicemail services with Directory, Call Conferencing, Interactive Voice

Response, Call Queuing. It has support for three-way calling, caller ID services, ADSI, SIP and

H.323 (as both client and gateway). Check the Features section for a more complete list.

Asterisk needs no additional hardware for Voice over IP. For interconnection with digital and

analog telephony equipment, Asterisk supports a number of hardware devices, most notably all

of the hardware manufactured by Asterisk's sponsors, Digium™. Digium has single and quad

span T1 and E1 interfaces for interconnection to PRI lines and channel banks as well as a single

port FXO card and a one to four-port modular FXS and FXO card. Also supported are the

Internet Line Jack and Internet Phone Jack products from Quicknet.

Asterisk supports a wide range of TDM protocols for the handling and transmission of voice

over traditional telephony interfaces. Asterisk supports US and European standard signaling

types used in standard business phone systems, allowing it to bridge between next generation

voice-data integrated networks and existing infrastructure. Asterisk not only supports

traditional phone equipment, it enhances them with additional capabilities.

Using the Inter-Asterisk eXchange (IAX™) Voice over IP protocol, Asterisk merges voice

and data traffic seamlessly across disparate networks. While using Packet Voice, it is possible

to send data such as URL information and images in-line with voice traffic, allowing advanced

integration of information.

6.1.1 Hardware used for building of Asterisk

We can use common PC machine, but power of PC is depend on number of calls. For small

area with a “few” users who have generated a small traffic we can use older inefficient

hardware. For example power of machines depending on number of callers we can see below in

tab. 9

Machine Concurrent calls Loading of CPU Codec

Pentium II, 300MHz, 128 MB

28 30% G.729

Xeon 2.4 GHz, 1 GB 500 100% G.729

Pentium 4, 2.6 GHz, 1 GB RAM

200 100% G.729

Tab. 9 - Number of concurrent calls on different machines

For building an exchange I had in hand PII machine with 256 MB RAM, 40 GB HDD with

Linux Redhat 9. After Asterisk installation I tested capability of this PBX exchange which have

been running on this machine. (installation of PBX is described in next subchapter). The

exchanges are assessed to number of concurrent calls in time. In Tab. 10 is described number of

new calls during one second, number of concurrent calls, retranslate calls, successful calls,

failed calls, unaccepted calls and average response on this machine.

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