Tuesday, August 11, 2009

CRBT - Color Ring Back Tone

A Ring-back Tone (RBT) is the audible ringing that is heard on the telephone line by the calling party after dialing and prior to the call being answered at the receiving end. This tone assures the calling party that a ringing signal is being sent on the called party's line, although the ring-back tone may be out of sync with the ringing signal. RBT is also known as Color Ringback Tone

Implementing CRBT in Mobile Network

Scenario 1 — ISUP Call Control Implementation
Scenario 2 — Through IN Signaling
Scenario 3 — CRBT with IN Call Party Handling

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