Method for realizing anomaly detection of PCM (Pulse Code Modulation) channel in VoIP (Voice over Internet Protocol) network terminal equipment

The invention relates to a method for realizing anomaly detection of a PCM (Pulse Code Modulation) channel in VoIP (Voice over Internet Protocol) network terminal equipment. The method comprises the following steps that: a signal input end of a first external switching station and a signal output end of a second external switching station occupy the same time slot and a signal output end of the first external switching station and a signal input end of the second external switching station occupy the same time slot, so that a PCM code stream is directly accessed between the first external switching station and the second external switching station after two telephones are at off-hook states; and a transmission function of the PCM channel between the first external switching station and the second external switching station is tested through testing conversation quality. With the adoption of the method for realizing the anomaly detection of the PCM channel in the VoIP network terminal equipment, a hardware pro