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Building Enterprise Ready Telephony Systems with sipXecs 4.0

You're reading from   Building Enterprise Ready Telephony Systems with sipXecs 4.0 Leveraging open source VOIP for a rock-solid communications system

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Product type Paperback
Published in Jul 2009
Publisher Packt
ISBN-13 9781847196804
Length 314 pages
Edition 1st Edition
Tools
Concepts
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Toc

Table of Contents (17) Chapters Close

Building Enterprise-Ready Telephony Systems with sipXecs 4.0
Credits
About the Author
About the Reviewer
1. Preface
1. Introduction to Telephony Concepts and sipXecs FREE CHAPTER 2. System Planning and Equipment Selection 3. Installing sipXecs 4. Configuring Users 5. Configuring Phones in sipXecs 6. Connecting to the World with sipXecs 7. Configuring sipXecs Server Features 8. Using sipXecs—The User Perspective 9. Configuring Advanced sipXecs Features 10. Utilizing the sipXecs ACD Service 11. Maintenance and Security Glossary

Utilizing DIDs


A DID (Direct Inward Dialing) is a method that allows companies to own large blocks of telephone numbers that can be allocated to system users or services. DID services are most commonly used with digital circuits such as T1/E1/PRIs but may be available in certain areas on other circuit types.

Just before a call rings in on one of the available channels, the phone number that was dialed is transmitted. T1/E1/PRI gateways that are connected to the sipXecs PBX should then be configured to forward the dialed number to .

Routing the call to a particular user is easily accomplished by adding the DID as an alias on the user account or auto attendant that owns that DID. If the DID is to be used to access other resources on the PBX, consider using a phantom user as shown in the next section.

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