User`s guide

System Administrator’s Guide – Release 7.2.3.x
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trademarks of their respective owners.
Revised: September 1, 2010
Page 64
11 Dialing Rules and Service Groups
This section describes the procedures the Allworx system follows for placing outbound calls.
11.1.1 Dialing Rules
As a user dials digits on a phone, the system collects the digits, one at a time. How does it know when it
should wait for more digits (because the user is dialing slowly) or when it should take the digits it has and try
to make a call with them? The rules the server follows are called Dialing Rules. Dialing Rules specify to the
Allworx
server what digit sequences are valid to be dialed out on the public phone network.
Examples:
• When dialing a local number, you do not normally dial 1 and the area code. So, the system should
collect the first 7 digits dialed and then try to make the call. The server should not be waiting for more
digits.
• When you dial a long distance number, you normally dial 1 plus the area code and then the 7 digit local
number. The system needs to recognize this case distinctly from the local number case and know to
collect all 11 digits before trying to make the call.
In addition, some local calling areas require an area code to be dialed without the 1 prefix in order to properly
dial some numbers. This implies that these rules may vary depending on the local calling area where the
Allworx
server is installed.
11.1.2 Home Area Code
Some features of the Allworx server and phones (example: redialing from call history and when mapping
numbers to 11-digit form to SIP proxies) require the knowledge of the home area code. Therefore, this
information is a required part of the dialing rules to enable those features to operate as expected.
11.1.3 Service Groups
The server can use a variety of services to place outside calls such as: Digital Lines, CO lines, SIP
Gateways, and SIP Proxies. Some of these services may be optimum for particular types of calls. For
example, your SIP Proxy might be the least expensive way to make long distance calls but your CO lines are
best for local calls.
A Service Group is a collection of services that can be used to place outside calls. The server creates several
Service Groups automatically:
• All Digital Lines
• All Digital Lines & CO Lines
• All Digital Lines, CO Lines & SIP Gateways
• All SIP Gateways
• All SIP Proxies
• All Trunk Devices