CHAPTER15 Media
Mediant 1000 Gateway & E-SBC | User's Manual
DTMF digits are removed from the audio stream (and the 'DTMF Transport Type'
parameter is automatically set to Mute DTMF).
● The device is always ready to receive DTMF packets over IP in all possible
transport modes: INFO messages, NOTIFY, and RFC 2833 (in proper payload
type) or as part of the audio stream.
● To exclude RFC 2833 Telephony event parameter from the device's SDP, set the
'Declare RFC 2833 in SDP' parameter to No.
● You can use the following parameters to configure DTMF digit handling:
✔ FirstTxDTMFOption, SecondTxDTMFOption, RxDTMFOption,
RFC2833TxPayloadType, and RFC2833RxPayloadType
✔ MGCPDTMFDetectionPoint, DTMFVolume, DTMFTransportType,
DTMFDigitLength, and DTMFInterDigitInterval
Configuring RFC 2833 Payload
You can configure the RFC 2833 payload.
➢ To configure RFC 2833 payload:
1. Open the RTP/RTCP Settings page (Setup menu > Signaling & Media tab > Media folder >
RTP/RTCP Settings).
2. Configure the following parameters:
● 'RTP Redundancy Depth' (RTPRedundancyDepth) - enables the device to generate RFC
2198 redundant packets.
● For Gateway application only: 'Enable RTP Redundancy Negotiation' (EnableRTPRe-
dundancyNegotiation) - enables the device to include the RTP redundancy dynamic
payload type in the SDP, according to RFC 2198.
● 'RFC 2833 TX Payload Type' (RFC2833TxPayloadType) - defines the Tx RFC 2833
DTMF relay dynamic payload type.
● 'RFC 2833 RX Payload Type' (RFC2833RxPayloadType) - defines the Rx RFC 2833
DTMF relay dynamic payload type.
● 'RFC 2198 Payload Type' (RFC2198PayloadType) - defines the RTP redundancy packet
payload type according to RFC 2198.
3. Click Apply.
Configuring RTP Base UDP Port
You can configure the range (pool) of local UDP ports from which the device allocates ports to
media (RTP, RTCP, and T.38) channels (legs). The maximum range of UDP ports is from 6,000
through to 64,000.
The consecutive port offset from the RTP port for RTCP and T.38 traffic is one and two,
respectively. For example, if the voice session uses RTP port 6000, the device allocates ports
6001 and 6002 for RTCP and T.38, respectively. However, you can configure the device to use the
same port for RTP and T.38 packets, by configuring the T38UseRTPPort parameter to 1.
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