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Chapter 9

Operator Work Station Protocol

9.1 Introduction

9.2 Signaling Overview

9.3 Parameters

9.1 Introduction

This chapter provides the following information: · Operator Workstation protocol signaling · Operator Workstation protocol parameters.
The Operator Workstation Protocol implements the PBX-side of an analog loop start connection. The protocol talks with analog phones over a local loop link. It is implemented by the STA0 TCP. This protocol needs an NMS analog board to operate, and the board must be capable of providing loop current and ring voltage to a passive terminal. AG-8 boards, AG 2000 boards and S-Connect boards (with support of additional AG resource boards) have configurations that support this capability.

9.2 Signaling Overview

The following tables illustrate analog loop start signaling. Two tables are necessary because the protocol changes depending on the side that starts the call.
The following table illustrates the case where the PBX (for instance using the Natural MicroSystems STA0 TCP) presents the call to the terminal equipment. State Outbound PBX Line Inbound terminal Idle No loop current Ringing Apply ringing voltage Ringing voltage (Telephone rings) At this point, the call can be answered. If it is answered, the phone is picked up, and loop current flows in the circuit. If the call is not answered after a certain number of rings instead, the STA0 TCP abandons the call. Answer - conversation state \xdf Loop current, voice "Off-hook" PBX clears first (optional) Loop current interruption, or cleardown tone Clear \xdf Loop current interruption "On-hook" Idle No loop current
The following table illustrates the case where the terminal equipment places a call to the PBX. State Outbound terminal Line Inbound PBX Idle No loop current Seizure "Off-hook" Loop current Seizure acknowledge \xdf Dial tone Here the outbound side starts to send the address information. This can be done by means of DTMF tones, or by decadic pulses. If the method is decadic pulses, the loop current goes on (pulse on) and off (pulse off) repeatedly to signal the digits. When the address information has been completely received, the STA0 TCP presents the call to the application. The application must then decide if the call is to be accepted or rejected. If the call is accepted, the STA0 TCP plays ring tone on the line. Call progress tones \xdf Ring tone If the call is rejected, the STA0 TCP plays busy tone on the line. The terminal is expected to abandon the call, and turn off loop current. Answer - conversation state \xdf Voice PBX clears first (optional) \xdf Loop current interruption, or cleardown tone Clear "On-hook" Loop current interruption Idle No loop current

State	Outbound PBX	Line	Inbound terminal
Idle		No loop current
Ringing	Apply ringing voltage	Ringing voltage	(Telephone rings)
At this point, the call can be answered. If it is answered, the phone is picked up, and loop current flows in the circuit. If the call is not answered after a certain number of rings instead, the STA0 TCP abandons the call.
Answer - conversation state		\xdf Loop current, voice	"Off-hook"
PBX clears first (optional)		Loop current interruption, or cleardown tone
Clear		\xdf Loop current interruption	"On-hook"
Idle		No loop current

State	Outbound terminal	Line
Idle		No loop current
Seizure	"Off-hook"	Loop current
Seizure acknowledge		\xdf Dial tone
Here the outbound side starts to send the address information. This can be done by means of DTMF tones, or by decadic pulses. If the method is decadic pulses, the loop current goes on (pulse on) and off (pulse off) repeatedly to signal the digits. When the address information has been completely received, the STA0 TCP presents the call to the application. The application must then decide if the call is to be accepted or rejected. If the call is accepted, the STA0 TCP plays ring tone on the line.
Call progress tones		\xdf Ring tone
If the call is rejected, the STA0 TCP plays busy tone on the line. The terminal is expected to abandon the call, and turn off loop current.
Answer - conversation state		\xdf Voice
PBX clears first (optional)		\xdf Loop current interruption, or cleardown tone
Clear	"On-hook"	Loop current interruption
Idle		No loop current

9.3 Parameters

The following table describes Operator Work Station (ADI.STA) parameters: Field Name Type/Unit Default Description waitforPCtime ms 10000 Time to wait for the application to respond after an ADIEVM_INCOMING_CALL. If a response is not received within the timeout, the incoming call is rejected. numdigits count 3 Number of inbound digits to expect wait1stdigittime ms 7000 Time to wait for first digit after loop current on. waitfordigitstime ms 8000 Time to wait for each subsequent digit defaulttone Integer 2 Tone to play if waitforPCtime expires: Value Definition 0 fast busy (reorder) 1 ring 2 busy playdialtone Integer 1 Play dial tone after seizure (1) or play nothing (0). releasecalloption Integer 0 Cleardown tone to play or action to take when releasing a call first: Value Definition 0 no action 1 loop current interruption (no cleardown tone) 2 dial tone 3 busy 4 fast busy (reorder) optionflags mask 0 A few flags in a bit mask: · bit 0 (&0x1) play reorder when blocking · bit 1 (&0x2) no loop current when blocking reserved Integer 0 Reserved (for future enhancements) maxringseconds Integer 60 Maximum time to keep ringing when placing an outbound call loopdroptime Integer 50 Time to drop loop current during release of an outbound call, in seconds (if loop current interruption is the chosen release method). cidsupport Integer 0 Caller ID supported if equal to 1. Note: Caller ID not supported for this release. qualaddron ms 50 Loop current on qualification time during addressing. qualaddroff ms 50 Loop current off qualification time during addressing. qualdisconnect ms 150 Qualification time of loop current off during the connected state. qualpermsignal ms 60000 Qualification time of loop current on when disconnecting or blocking, to declare line out-of-service. outring1ontime ms 1000 Duration of ring voltage while placing a call. outring1offtime ms 3000 Duration of ring voltage off, while placing a call. outring2ontime ms 0 Duration of ring voltage for second ring in cycle, while placing a call (UK-style ringing). outring2offtime ms 0 Duration of ring voltage off for second ring in cycle, while placing a call (UK-style ringing). ringamp Internal 112 Amplitude of ring-back tone. ringfreql Hz 440 Low or only frequency of ring-back tone. ringfreqh Hz 480 High frequency of ring-back tone. ringontime ms 1000 Ring back time on. ringofftime ms 3000 Ring back time off. busyamp Internal 63 Amplitude of busy tone. busyfreql ms 480 Low or only frequency of busy tone. busyfreqh ms 620 High frequency of busy tone. busyontime ms 500 Busy time on. busyofftime ms 500 Busy time off. reorderamp Internal 63 Amplitude of fast busy (reorder) tone. reorderfreql ms 480 Low or only frequency of fast busy (reorder) tone. reorderfreqh ms 620 High frequency of fast busy (reorder) tone. reorderontime ms 250 Fast busy (reorder) time on. reorderofftime ms 250 Fast busy (reorder) time off. dialtoneamp Internal 150 Amplitude of dial tone. dialtonefreql ms 350 Low or only frequency of dial tone. dialtonefreqh ms 440 High frequency of dial tone. dialtoneontime ms 65535 Dial tone time on (for interrupted dial tones). dialtoneofftime ms 0 Dial tone time off (for interrupted dial tones).

Field Name	Type/Unit	Default	Description
`waitforPCtime`	ms	`10000`	Time to wait for the application to respond after an `ADIEVM_INCOMING_CALL`. If a response is not received within the timeout, the incoming call is rejected.
`numdigits`	count	`3`	Number of inbound digits to expect
`wait1stdigittime`	ms	`7000`	Time to wait for first digit after loop current on.
`waitfordigitstime`	ms	`8000`	Time to wait for each subsequent digit
`defaulttone`	Integer	`2`	Tone to play if waitforPCtime expires: Value Definition 0 fast busy (reorder) 1 ring 2 busy
`playdialtone`	Integer	`1`	Play dial tone after seizure (1) or play nothing (0).
`releasecalloption`	Integer	`0`	Cleardown tone to play or action to take when releasing a call first: Value Definition 0 no action 1 loop current interruption (no cleardown tone) 2 dial tone 3 busy 4 fast busy (reorder)
`optionflags`	mask	`0`	A few flags in a bit mask: · bit 0 (&0x1) play reorder when blocking · bit 1 (&0x2) no loop current when blocking
`reserved`	Integer	`0`	Reserved (for future enhancements)
`maxringseconds`	Integer	`60`	Maximum time to keep ringing when placing an outbound call
`loopdroptime`	Integer	`50`	Time to drop loop current during release of an outbound call, in seconds (if loop current interruption is the chosen release method).
`cidsupport`	Integer	`0`	Caller ID supported if equal to 1. Note: Caller ID not supported for this release.
`qualaddron`	ms	`50`	Loop current on qualification time during addressing.
`qualaddroff`	ms	`50`	Loop current off qualification time during addressing.
`qualdisconnect`	ms	`150`	Qualification time of loop current off during the connected state.
`qualpermsignal`	ms	`60000`	Qualification time of loop current on when disconnecting or blocking, to declare line out-of-service.
`outring1ontime`	ms	`1000`	Duration of ring voltage while placing a call.
`outring1offtime`	ms	`3000`	Duration of ring voltage off, while placing a call.
`outring2ontime`	ms	`0`	Duration of ring voltage for second ring in cycle, while placing a call (UK-style ringing).
`outring2offtime`	ms	`0`	Duration of ring voltage off for second ring in cycle, while placing a call (UK-style ringing).
`ringamp`	Internal	`112`	Amplitude of ring-back tone.
`ringfreql`	Hz	`440`	Low or only frequency of ring-back tone.
`ringfreqh`	Hz	`480`	High frequency of ring-back tone.
`ringontime`	ms	`1000`	Ring back time on.
`ringofftime`	ms	`3000`	Ring back time off.
`busyamp`	Internal	`63`	Amplitude of busy tone.
`busyfreql`	ms	`480`	Low or only frequency of busy tone.
`busyfreqh`	ms	`620`	High frequency of busy tone.
`busyontime`	ms	`500`	Busy time on.
`busyofftime`	ms	`500`	Busy time off.
`reorderamp`	Internal	`63`	Amplitude of fast busy (reorder) tone.
`reorderfreql`	ms	`480`	Low or only frequency of fast busy (reorder) tone.
`reorderfreqh`	ms	`620`	High frequency of fast busy (reorder) tone.
`reorderontime`	ms	`250`	Fast busy (reorder) time on.
`reorderofftime`	ms	`250`	Fast busy (reorder) time off.
`dialtoneamp`	Internal	`150`	Amplitude of dial tone.
`dialtonefreql`	ms	`350`	Low or only frequency of dial tone.
`dialtonefreqh`	ms	`440`	High frequency of dial tone.
`dialtoneontime`	ms	65535	Dial tone time on (for interrupted dial tones).
`dialtoneofftime`	ms	`0`	Dial tone time off (for interrupted dial tones).

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