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Chapter 4
Voice over IP
E-DOC-CTC-20050401-0008 v1.0
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Configure the telephony
service
To configure the SIP telephony service:
1 Go to the SpeedTouch™ web pages.
2 In the menu select Toolbox > Telephony.
3 On the top right, click Expert configure.
4 Enter the IP address and the port number of the registrar and the proxy, as
provided by your ISP:
5 Click Apply.
Verifying telephone
connectivity
To verify the voice connection:
1 Make sure the SpeedTouch™ is powered on and ready for service.
2 Check whether your phone is properly attached to the SpeedTouch™.
3 Make sure the Internet telephony service is enabled and configured.
4 The VoIP Ready LED must be on.
5 Pick up your phone, wait for the dial tone, and dial the number. You can dial a
‘#’ after the phone number to indicate the end of the number, as a result of
which the phone number will be called instantly.
Some of the SIP components are explained below:
Proxy: The SIP proxy server at your provider’s forwards signalling
messages between the caller and callee.
Registrar: The SIP registrar resembles a DNS, as it matches your URI
with your IP address. Your SpeedTouch™ will periodically - depending
on the expire time - register its correct IP address with the SIP registrar
that may be collocated with the proxy server.
Expire Time: This is the frequency with which your IP address is
updated on the registrar.
The phone(s) attached to the SpeedTouch™ are reachable for incoming VoIP
calls, as long as your SpeedTouch™ is powered on and the VoIP Ready LED is
on.
For calls over the regular phone line, your phones are line powered by the
telephone company and thus are always reachable, even if the modem is
powered off.