Page 511 - Asterisk™: The Future of Telephony

(defined in sip_notify.conf). Because each of these messages is manufacturer-specific,
support varies from phone to phone.

skinny.conf

If you wish to connect to phones using Cisco’s proprietary Skinny Client Control Pro-
tocol (SCCP), you can use the skinny.conf file to define the parameters and channels
that will use it. However, since the SCCP protocol is proprietary, you may find that
support in Asterisk for this protocol is less than perfect but steadily improving over time.

sla.conf

Even though Asterisk is a modern PBX, many people still want it to behave like an old
key system with shared lines. Asterisk can emulate a key system by configuring shared
lines in sla.conf.

smdi.conf

This file configures the Station Message Desk Interface. SMDI is a very useful addition
to Asterisk, as it will allow it to act as a voicemail system for legacy PBXes that support
the SMDI protocol.

udptl.conf

This file is used for the configuration of Asterisk’s support for UDPTL packets. UDPTL
packets are one of the transports used by T.38 faxing over IP connections.

users.conf

With the advent of the Asterisk GUI, the Asterisk developers found it would be helpful
to create a configuration file where user accounts can be specified, instead of having
different pieces spread across a myriad of files (such as extensions.conf, sip.conf, and
voicemail.conf. This file is also updated by the Asterisk GUI when new users are added
to the system or when user settings are modified.

voicemail.conf

The voicemail.conf file controls the Asterisk voicemail system (called Comedian Mail).
It consists of three main sections. The first, called [general], sets the general system-
wide settings for the voicemail system. The second, called [zonemessages], allows you
to configure different voicemail zones, which are a collection of time and time zone

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