Building Telephony Systems with OpenSIPS 1.6 by Flavio E. Goncalves

By Flavio E. Goncalves

It is a functional, hands-on e-book established round a fictitious case examine VoIP supplier that you'll construct on a improvement server utilizing OpenSIPS 1.6. The case research grows bankruptcy through bankruptcy, from fitting your neighborhood improvement server, correct as much as the completed VoIP supplier. This ebook is for readers who are looking to know the way to construct a SIP supplier from scratch utilizing OpenSIPS. it truly is compatible for VoIP prone, huge companies, and universities. Telephony and Linux adventure may be valuable yet isn't crucial. Readers needn't have past wisdom of OpenSIPS. This e-book also will aid readers who have been utilizing OpenSER yet are actually harassed with the recent OpenSIPS.

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Extra resources for Building Telephony Systems with OpenSIPS 1.6

Sample text

The tag parameter is used in the TO and FROM fields. It serves as a general mechanism to identify the dialog, which is a combination of the Call-ID along with the two tags—one from each participant in the dialog. Tags can be useful in parallel forking. Call-ID: This contains a globally unique identifier for this call generated by the combination of a random string and the hostname or IP address from the IP phone. A combination of the To, From, and Call-ID tags fully defines an end-to-end SIP relation known as a SIP dialog.

Any retransmissions of the request will then be handled by that server transaction. Example: For each request traversing our SIP proxy, we will: Step 1: Request validation • Check the message size to avoid buffer overflows • Check the Max-forwards header to detect loops Step 2: Routing information preprocessing • If a record-route header exists, process it Step 3: Determine the request target • Is it in the location database (registered users)? • Is there a route to the destination (gateway destinations)?

To complete the call, two SIP proxies are used. userA calls userB using its SIP identity, called the SIP URI. com. com. A call made using sips: (secure SIP) will use a secure transport (TLS-Transport Layer Security) between the caller and the callee. The transaction starts with userA sending an INVITE request addressed to userB. The INVITE request contains a certain number of header fields. Header fields are named attributes that provide additional information about the message. They include a unique identifier, the destination, and information about the session as shown here: The first line of the message contains the method name.

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