asterisk intro¶

SIP = almost universal VOIP protocol IAX2 (don’t use it!) Codec used to transfer voice-to-data is ULAW

Channels = how many translations from voice-to-data you need to handle. Generally about 1 channel unless you have scaling issues.

Registration = how your box is registered to accept calls for a particular number

Asterisk can do:

conference calls.

caller ID

special prompts

voice mail

asterisk-to-asterisk can be free because there is no middle parties

telemarketer torture

AEL = Asterisk Extension language¶

A C-like language used to configure the behavior of an asterisk installation

Warnings!¶

People can hack into your box and call Siberia.

SIPVicious is a tool originally written to check for hacks against Asterisk but is used to hack.

Can it be placed in the cloud or do we need a datacenter?

The internet goes down

64k bandwidth each way

Echos are troublesome (Open Source Echo Canceller)

Huge amounts of servers to run this thing

Changes in install screen¶

include the sounds in the codec (last three items)

Thoughts¶

check asterisk hosting

Resources¶

O’Reilly book: Asterisk: The future of telephony