In this chapter you have learned how to configure OpenSER to forward calls to a gateway. It is important to take care of the security. Using the permissions modules you can allow the gateways to bypass the digest authentication and permit them validating only its IP addresses. The group module is important for controlling the access from the UACs. It is interesting also to validate re-INVITES for their credentials. From the point you connect to the PSTN, take a lot of care about toll fraud. I recommend you to have a security specialist verifying your environment periodically. Often, analyze your call detail records to detect abnormal activity.
Building Telephony Systems with OpenSER
Building Telephony Systems with OpenSER
Overview of this book
Table of Contents (18 chapters)
Building Telephony Systems with OpenSER
Credits
About the Author
About the Reviewers
Preface
Free Chapter
Introduction to SIP
The SIP Express Router
OpenSER Installation
OpenSER Standard Configuration
Adding Authentication with MySQL
Building the User Portal with SerMyAdmin
Connectivity to the PSTN
Call Forward and Voice Mail
SIP NAT Traversal
OpenSER Accounting and Billing
Troubleshooting Tools
After Words
Index
Customer Reviews