| Configuring the Audio Settings | 132which can be used to identify the same key. If the End bit of a RTP packet is 1, the packet is the last DTMF tone. Thedefault telephoneEvent is 101, but you can change it.INBANDIn-band transmission method. DTMF tones are transmitted together with the voice band. By analyzing the highfrequency and the low frequency of the RTP packets, the device can identify the corresponding key.SIP INFOOut-band transmission method. DTMF tones are transmitted by SIP signaling path. The SIP INFO message cantransmit DTMF tones in three ways: DTMF, DTMF-Relay and Telephone-Event.Configuring DTMF for SIP ProtocolProcedure1. Do one of the following:• On your web user interface, go to Account > VC Platform > Video Conference Platform > PlatformType > Zoom/Pexip/BlueJeans/EasyMeet/Custom.• On your web user interface, go to Account > SIP Account/SIP IP Call.• On your VCS, go to More > Setting > Advanced > SIP IP Call.On your VP59, tap Setting > Advanced > SIP IP Call.• On your CTP20, tap Setting > Advanced > SIP IP Call.2. Configure and save the following settings:Parameter Description Configuration MethodDTMF Type Configure the DTMF type.• INBAND—DTMF digits aretransmitted in the voice band,together with the generalRTP voice packet.• RFC2833—DTMF digitsare transmitted by RTPpacket which is compliant toRFC2833.• SIP INFO—DTMF digitsare transmitted by SIP INFO.• RFC2833+ SIP INFO—DTMF digits are transmittedby RFC 2833 and the SIPINFO.Default: RFC2833.Web user interfaceEndpointCTP20DTMF Info Type Configure the DTMF info typewhen DTMF type is set to SIPINFO or RFC2833+SIP INFO.• DTMF-Relay• DTMF• Telephone-EventDefault: DTMF-Relay.Web user interfaceEndpointCTP20
