Wednesday TECHtionary.com TECH-Tip � CRBT-Color Ring Back Tone � �Making Billions On Ringing Phones�
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[August 31, 2005]

Wednesday TECHtionary.com TECH-Tip � CRBT-Color Ring Back Tone � �Making Billions On Ringing Phones�

The animated TECH-Tip tutorial is available at http://www.techtionary.com

Summary

CRBT-Color Ring Back Tone replaces traditional ringing tones with customer designated or generated tones, speech, music or other sounds. CRBT is based on SIM-Subscriber Identity Modules which are independent of carrier service providers or handset model. CRBT is a new source of revenue based on longer connect time, download fees and subscription services.



Details

This is the full-length version including other SS7 functions for call completion, conversation and release (disconnect).



This is a self-repeating tutorial on RLT-Release Link Trunking where after transferring a call unused "trombone" (like the musical instrument with dual slides) trunks are released (disconnected).

1 - Caller dials a CRBT service subscriber.

2 - Incoming call initiates IN-Intelligent Network and routes the call via SS7-ISUP-IAM to the CRBT server via the SCP-Service Control Point.

A Q.931-SS7-ISUP-ISDN-Integrated Services Digital Network User Part IAM-Initial Address Message is sent with the Routing label, CIC-Circuit Identification Code and Message Type Code. Examples of Message Type Codes include: Called Number, Calling Number, DPC-Destination Point Code, OPC-Origination Point Code.

As the IAM passes through switching centers circuits (shown in blue) are reserved.

3 - CRBT server generates color tone which is sent to the caller via SS7.

4 - CRBT tone server dials the called party via SS7-ISUP-IAM "tromboning" on another SS7 link.

Once the IAM-Initial Address Message is processed at the DPC-Destination Point Code (switch), an SS7-ISUP ACM-Address Complete Message is sent to the OPC-Origination Point Code (switch). The ACM is used also used to indicate the start of billing.

Upon off-hook connect, the reserved trunks are activated and an ANM-ANswer Message completes the call setup/connect and communication (conversation) begins.

Upon RELease or disconnect (on-hook), a series of SS7-ISUP messages are sent to teardown (release) the trunks, terminate billing, and provide network management and testing for the next call.

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