Audio Features265Audio FeaturesThis chapter describes the audio sound quality features and options you can configure for the IP phone.TopicsAlert ToneRing TonesDistinctive Ring TonesRinger DeviceAudio VolumeTonesAudio CodecsPacketization Time (PTime)Early MediaHeadset PriorDual HeadsetAcoustic Clarity TechnologyDTMFVoice Quality Monitoring (VQM)Silent ModeAlert ToneYou can configure the following audio alert for the phone:l Redial tone: allow the phones to continue to play the dial tone after inputting the preset numbers on the dialingscreen.l Voice mail tone: allow the IP phone to play a warning tone when receiving a new voice mail. You can customize thewarning tone or select specialized tone sets (vary from country to country) for your IP phone.l Send tone: allow the IP phone to play a key tone when you tap the send key. It works only if the key tone is enabled.l Dial tone: allow the IP phone to play a specific dial tone for a specified time.l Key tone: allow the IP phone to play a key tone when you press or tap any key.TopicAlert Tone ConfigurationAlert Tone ConfigurationThe following table lists the parameters you can use to configure the alert tone.Parameter features.redial_tone .cfgDescriptionIt configures that after you enter a specific number on the dialing screen, the phone will replay the dialtone.Note: It is not applicable to CP960 phones.Example:features.redial_tone = 123The phone will continue to play the dial tone after inputting “123” on the dialing screen.