0x01E2 RFC 2833 Enable

Use this TLV to allow the in-band DTMF signals to be relayed within the VoIP media stream utilizing a special RTP payload type. Low bit-rate audio codecs (such as G.729 or G.723.1) can compromise the signal integrity of DTMF digits (and other telephony tones and signals); hence causing inaccurate and poor detection/recognition of the DTMF digits at the recipient side. When this feature is enabled the incoming DTMF digits, if detected, are removed from the audio stream by the VDAC-ONE or IP Network Interface Series 2 card connected to the originator of the DTMF digits. The information regarding the detected and removed DTMF digits is embedded within the RTP stream using a special payload format. The VDAC-ONE or IP Network Interface Series 2 card at the receiving side will decode this special RTP payload that carries DTMF digits and regenerate the DTMF signal toward the receiving PSTN side.

If you are using the VDAC-ONE card, this TLV can be configured only before or during the call establishment. It cannot be set during an active call. If you are using the IP Networking Series 2 card, this TLV can be configured while the call is active.

Important! The CSP does NOT support RFC 2833 via H.323 signaling.

Used in:
0x1E Generic PPL ICB in:
Resource Attribute Configure/Query message
Route Control message
Outseize Control message