DSP Service Request 0x00BD

Use this message to allocate a DSP service on the specified channel. DSP services supported are:

After this message is sent the Excel platform sends the Call Processing Event (0x2E) message to report the occurrence of a corresponding Event on the specified channel. However, if the DSP service type is Call Progress Analysis (0x03) the Excel platform answers with a Call Progress Analysis Result (0x34) message.

Digital Signal Processor

A computer, attached to the Excel platform through an RS-232 or Ethernet link, from which you run the telecommunications application that controls the Excel platform.

Range of channels provided by T1 or E1 transmission service. A physical span is a group of channels taking up a single physical wire. A logical span is a group of channels taking up less than a single logical wire, or carried over more than one physical wire.

A group of data bits in a specific format, with a flag at each end to indicate the beginning and the end of the frame.

See Address Information Block.

Most Significant Bit

Least Significant Bit

In PPL, a condition that, when met, drives a state machine (PPL Component) from one state to another, by invoking an associated Primitive. In PPL files, an Event is marked by an arrow and text.

MESSAGE (White)		RESPONSE (Gray)
Byte	Field Description	Byte	Field Description
0	Frame (0xFE)	0	Frame (0xFE)
1, 2	Length (0x00NN)	1, 2	Length (0x0007)
3, 4	Message Type (0x00BD)	3, 4	Message Type (0x00BD)
5	Reserved (0x00)	5	Reserved (0x00)
6	Sequence Number	6	Same Sequence Number
7	Logical Node ID	7	Logical Node ID
:	AIB Address Method 0x00 - Individual AEs	8, 9	Status (MSB, LSB) 0x0002 DSP Receiver Request Timeout
	AIB Address Method 0x00 - Individual AEs	10	Checksum
	Number of AEs to follow
	AE 0x0D Channel
:	Service Type 0x01 DTMF Receiver 0x02 Energy Detection 0x03 Call Progress Analysis Receiver 0x04 Coin Tone Receiver 0x81 DTMF Receiver, Matrix Based RFC 2833 collection 0xC1 DTMF Receiver, Matrix Based on SUBSCRIBE/NOTIFY
:	Data[0 . . . ] The meaning of the Data fields depends on the Service Type. See below. 0x01 DTMF Receiver (0x01) and 0x81 DTMF Receiver, Matrix Based RFC 2833 Collection The DTMF receiver data instructs the Excel platform to attach a digit receiver to the specified channel and to start collecting digits. The call must be in a state other than idle, out of service, or busied out. The Excel platform sends Call Processing Event messages with event "digits" for every digit collected. If an error condition occurs, the Excel platform sends a Call Processing Event message with the "Status" field indicating the error. The host application is responsible for instructing the Excel platform to release the digit receiver when either the receiver is finished collecting digits or when an error condition occurs. The host accomplishes the release by sending a DSP Service Cancel message. If the call is disconnected, the Excel platform releases the digit receiver. Data[0,1] Digit Timer The maximum amount of time to wait for the digit. The following values disable this timer: 0xFFFF 0x0000 0x0001 0x0002 Data[2] Configuration Bits (0 = disabled, 1 = enabled) Bit 0 Report the digit at its falling edge (when the first digit is released). If the bit is not set the digit will be reported at its rising edge (when the digit is first entered). Bit 1 Ignore "#" character as first digit. Bit 2 Report digit duration (the amount of time the digit has been pressed). Valid only if Configuration Bit Number 0 is 1. Bits 3–7 Reserved, must be 0.
	Data[3,4] Minimum Receive Digit Duration Timer Valid timer values: 0x0000–0xFFFE The minimum amount of time for a digit to be present before it is detected and validated. If you send the values 0x0000 through 0x0002, the Excel platform automatically sets the time to 0x0003. NOTE: You may set either the Digit Timer or the Minimum Digit Duration timer to 0xFFFF, but not both. If you set both timers to 0xFFFF, this message cannot detect digits.
	0x02 Energy Detection Data[0] Sensitivity Level The loudness is measured by the energy level present for white noise (constant energy) at a specified dBm level, ranging from 0 dBm (loudest) to -30 dBm (quietest). A sensitivity level of 0 dBm, the least sensitive, would be used in a case where there is a high level of background noise expected. A sensitivity level of -30 dBm, the most sensitive would be used if there is little background noise expected. 0x00 0 dBm 0x01 0 5 dBm 0x02 10 dBm 0x03 15 dBm 0x04 20 dBm 0x05 25 dBm 0x06 30 dBm Data[1] Reporting Mode 0x01 Report Initial Energy Detection Only 0x02 Report All Energy Threshold Crossings Data[2,3] Scan Duration The scan duration must be expressed in 20 ms increments (10 ms units). For example: 0x0002 = 20ms 0x0004 = 40 ms 0x0006 = 60 ms, etc. Odd increments are rounded down (for example, 0x0003 = 20ms). For more information on energy detection, refer to the API Developer’s Guide: Overview. Data[4,5] Completion Timer The maximum amount of time to scan for energy. The following values disable this timer: 0xFFFF 0x0000 0x0001 0x0002
	0x03 Call Progress Analysis Receiver Allows the host to perform interactive CPA on a channel. Data[0] CPA Class 0x00 North American Default 0x01 Dialtone 0x02 CPC Detection 0x03 Energy Detection
	0x04 Coin Tone Receiver Data[0,1] Completion Timer The maximum amount of time to scan for Coin Tones. If the completion timer expires, the Excel platform releases the Coin Tone receiver. This field may be set to 0xFFFF to disable the timer.
:	Checksum