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

Byte | Description
0, 1 | Tag 0x01E2
2, 3 | Length 0x0001
4 | Value[0] 0x00 RFC 2833 disabled (in-band digit transmission) (Default) 0x01 RFC 2833 enabled (out-of-band digit transmission) 0x02 Digit transmission disabled

Tag-Length-Value block. A standardized block that allows data to inserted in a standard way into API messages.
Voice over Internet Protocol. The delivery of voice information in digital form in discrete packets rather than in the traditional circuit-committed protocols of the public-switched telephone network (PSTN).
Real-Time Transport Protocol. Supports transport of real-time data like interactive voice and video over packet-switched networks.
Internet Protocol. Part of the TCP/IP family of protocols used to route messages and tracks the addresses of nodes.
Public Switched Telephone Network
ITU-T standard defines a set of call control, channel setup, and codec specifications for transmitting real-time voice and video over networks that do not offer guaranteed service or quality of service.
See Programmable Protocol Language.
See Information Control Block.
Outgoing call setup during real-time call processing on a specific channel.