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G1 General
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The dialed-digit packet format can be used to transport DTMF signals across an MPLS connection for reproduction at the other side ITU Recommendation Q23 defines the frequency coding of DTMF Payload carrying DTMF digits will be identified using payload type of 240 Dialed-digit packets constitute a separate, secondary information stream that avoids dependence on the audio-encoding profile in effect Some lowbit-rate audio encoding, such as G7231, does not convey multifrequency tones with acceptable fidelity Other audio encodings that have higher fidelity may not require the support of dialed-digit packets, but can still find savings in bandwidth by the use of the dialed-digit procedure The transmission of dialed-digit packets is optional Dialed digits may be used in the middle of a call to convey user commands to a device at the far end of a connection, such as an automatic voice message recording system Dialed-digit and audio-encoding packets may occur at the same time They are independent streams and may experience differential delay in reconstruction and play out In general, dialed-digit signals are generated to be recognized by machines; during the intervals of operation, other audio in the same direction is ignored For the most reliable operation, transmitters should stop sending audio packets while detecting and sending dialed digits However, specification of the behavior of transmitting users is beyond the scope of this Implementation Agreement For this reason, receivers should discard any audio while playing out dialed digits instead of striving to merge the two streams
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G2 Control Subframe Format
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The dialed-digit control subframe is sent with triple redundant transmission The control subframes are sent three times, with a fixed interval between transmissions (see Section 674) The format of dialed-digit packets is shown in Figure 6-25
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Figure 6-25 Dialed-digit control subframe format
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0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 CID value Redundancy Payload type = 240 Signal Level Digit Type Timestamp Digit Code Reserved 0 1
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Signal Level The Signal Level field is coded with a binary value from 0 to 31, signifying a total power level of 0 to -31 dBm0 Levels of -31 dBm0 and below are indicated by the value 31, and levels of 0 dBm0 and above are indicated by the value 0 All other values in the Signal Level field are reserved Digit Type The Digit Type field is coded according to Table 6-5 Digit Code The Digit Code field is coded according to Table 6-6 for DTMF
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G3 Transmitter Procedures
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When a transmitter wants to convey the beginning of a dialed digit to the receiver, the dialed-digit control subframe is sent with triple redundancy at intervals of 5 ms If a tone persists, every 500 ms after the dialed-digit frame is sent to refresh the play out (with the Redundancy field coded as value 3) If a new event is conveyed before the triple redundancy of a previous event has completed, the transmitter stops sending control subframes for the previous event in order to avoid the interleaving of two different timestamps A user transmitting dialed digits should ensure that no more than 20 ms of DTMF tones are allowed to pass through the encoded audio path, so that differential delays between the two streams do not cause false double sig-
Table 6-5 Dialed-Digit Codes
Digits Type 000 001 010 to 111
Meaning Reserved DTMF Reserved
MPLS Forum VoMPLS Implementation Agreement
Table 6-6 DTMF Dialed-Digit Codes
Digit Code 00000 00001 00010 00011 00100 00101 00110 00111 01000 01001 01010 01011 01100 01101 01110 01111 10000 to 11110 11111
Meaning 0 1 2 3 4 5 6 7 8 9
# A B C D Reserved Tone off
nals at the far-end receiver If a transmitter detects multifrequency tones but is not capable of determining their level, it sets the Signal Level field to a preset value
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