Administrator‘s Guide for Yealink VC110 Video Conferencing Endpoint110INBANDDTMF digits are transmitted within the audio of the IP phone conversation. It uses thesame codec as your voice and is audible to conversation partners.SIP INFODTMF digits are transmitted by the SIP INFO messages when the voice stream isestablished after a successful SIP 200 OK-ACK message sequence. The SIP INFOmessage is sent along the signaling path of the call. The SIP INFO message can transmitDTMF digits in three ways: DTMF, DTMF-Relay and Telephone-Event.DTMF parameters on the endpoint are described below:Parameter Description Configuration MethodDTMF TypeConfigures the DTMF type. Youcan configure it for the SIPaccount or SIP direct accountseparately. INBAND—DTMF digits aretransmitted in the voiceband. RFC2833—DTMF digits aretransmitted by RTP Eventscompliant to RFC 2833. SIP INFO—DTMF digits aretransmitted by the SIP INFOmessages.Default: INBANDRemote ControlWeb User InterfaceDTMF Info TypeConfigures the DTMF info typewhen DTMF type is set to SIPINFO. You can configure it for theSIP account or SIP direct accountseparately. DTMF-Relay DTMF Telephone-EventDefault: DTMT-RelayRemote ControlWeb User InterfaceTo configure DTMF type for SIP account via web user interface:1. Click on Account->SIP Account.2. Select the desired value from the pull-down list of DTMF Type.