| 摘要 |
In a communications network that provides customized ring back tone (CRBT) service to voice over Internet protocol (VoIP) telephone calls, an announcement is played to a called party having CRBT service with VoIP telephony, after the called party answers a ringing signal but before a communications pathway is established between the calling party and the called party. The announcement notifies the called party of an incoming call during the time that a pathway is being set up and which would otherwise be silent.
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