| Configuring the Audio Settings | 131Parameter Description Configuration MethodH.265 Mode H.265 video codec.• VBR- the output data rate ofthe H.265 codec varies pertime segment. You can savenearly half the bandwidth.• CBR- the output data rate ofthe H.265 codec is constant.If the latency issue appearsin the call or video image isabnormal, it may result frompacket loss, you can selectthis value to try to fix thisissue.Default: VBR.Web user interfaceDTMFDTMF is the signal sent from the system to the network, which is generated when pressing the keypad during a call.Each key pressed generates one sinusoidal tone of two frequencies. One is generated from a high frequency group andthe other from a low frequency group.• DTMF Keypad• Transmission Ways of DTMF• Configuring DTMF for SIP Protocol• Configuring DTMF for H.323 ProtocolDTMF KeypadThe DTMF keypad is laid out in a 4×4 matrix, with each row representing a low frequency, and each columnrepresenting a high frequency. Pressing a digit key (such as '1') will generate a sinusoidal tone for each of twofrequencies (697 and 1209 hertz (Hz)). The switch can decode the frequency group and locate the corresponding key.DTMF Keypad Frequencies:1209 Hz 1336 Hz 1477 Hz 1633 Hz697 Hz 1 2 3 A770 Hz 4 5 6 B852 Hz 7 8 9 C941 Hz * 0 # DTransmission Ways of DTMFThree ways to transmit DTMF tones are as below: RFC2833, INBAND, SIP INFO.RFC 2833In-band transmission method. DTMF tones are transmitted by RTP, and the RFC 2833 packets are marked byTeleponeEvent (RTP PayloadType). One DTMF tone consists of several RTP packets with the same timestamps,
