cSipMediaStreamType 1.3.6.1.4.1.9.9.995.1.1.4.1.4

This object identifies the type of the Media Stream. 'voiceOnly' - Voice-only media streams send all audio from the DS0 channel. 'dtmfRelay' - Dual Tone Multi Frequency Tones. 'voiceAndDtmfRelay' - Send both encoded voice and DTMF-relay packets.