MAPS™ CAS Protocol Emulator

FGD Call Simulation

The following table describes the line signaling for a typical call:

MAPS™ CAS FGD can place and answer call on the selected timeslot and Send or Receive Traffic. The ready scripts used can detect events and respond with appropriate actions with respect to the states.

FGD Place and Answer Scripts

The Events encountered during the progress of the calls are logged as seen in the screen below.

FGD Call Events Log

T1 Wink Start (R1 wink) Call Simulation

Call Generation feature allows the user to simulate incoming and outgoing communications in CAS network, where signaling transitions occurs between switches, using proper scripts and profiles. The profile allows necessary parameters of call controls to be changed during runtime.

The following depicts the typical CAS signaling procedure for Loop Start lines -

Side A to Side B CAS Call Flow

The screenshot below shows MAPS™ acting as outbound terminal and transmitting the signaling bits to the other switch

CAS CIDCW – Call ID Call Waiting Script

MAPS™ provides Event Log, Error Events, and Captured Errors report log encountered during the progress of the call.

CIDCW Call Events Log

European Sweden P7 Call Simulation

The following table describes the line signaling for a typical call:

CAS Signaling PABX (tProbe™) to Multiplexer (Subscriber)

MAPS™ CAS SwedenP7 can place and answer call on the selected timeslot and Send or Receive Traffic. The ready scripts used can detect events and respond with appropriate actions with respect to the states.

SwedenP7 Place and Answer Scripts

The Events encountered during the progress of the calls are logged as seen in the screen below.

SwedenP7 Call Events Log

Single Frequency (SF) Signaling

In analog circuits, channel bandwidth is divided into a 300 – 3400 Hz “voiceband” used for speech and/or data, and a “supervisory band” centered at 2400/2600/2800 Hz used for the signaling tone.  Because both the supervisory signal (SF Tone on Idle and Active modes) and line traffic are carried in the same channel, filters are normally required at each end of the connection to separate out the line signal from the voiceband traffic. 

MAPS™ CAS Single Frequency (SF) simulator can generate signaling tone on Idle and Active Modes with configurable operational frequency (2400/2600/2800 Hz) bands for analog G/G interface. It also has efficient filters to extract Voice from line signals and filters to inform the state of the remote-end efficiently.

Other related features include -

• Selection to SF signaling on Idle and Active mode operation
• User configurable Signaling Tone
• User control on call to Terminate, Answer, Reject calls
• Extracted voice can be recorded
• Ladder diagram for call flows
• Events window to keep track of the call status

The following are the examples of Call Supervision in SF Tone on Active Mode and Idle Mode:

• The caller’s DTMF digits is superimposed on the signaling tone as it is inserted when seizing the channel.
  
  
  
• The calling side seizes the line by dropping the signaling tone (Line seizure state). At this point, addressing tones are exchanged according to the signaling standard. 

The following call flows illustrate the SF Signaling procedure in Active Mode using MAPS™ CAS

SF Signaling Place Call Message Sequence (ACTIVE Mode)	SF Signaling Answer Call Message Sequence (ACTIVE Mode)

MAPS™ CAS SF Signaling can place and answer call (in both Active mode and Idle modes)on the selected timeslot and Send or Receive Traffic over established call.

SF Signaling Place Call Simulation (ACTIVE Mode)	SF Signaling Answer Call Simulation (ACTIVE Mode)
SF Signaling Place Call Simulation (IDLE Mode)	SF Signaling Answer Call Simulation (IDLE Mode)

Voice Call Signaling

Voice call lines are typically used for four-wire, point-to-point, two-way voice calls.  A Voice detect (VOX) circuit is used on the receive pair to detect incoming audio and signal the voice switch.  No signaling is used on the transmit pair. These calls are sometimes configured on 2w circuits.

MAPS™ CAS supports Voice Call Signaling by providing voice activated circuitry (VOX) to control voice connectivity and ensure immediate activation of the circuit upon receipt of incoming voice. During out-going call, it seizes (open) any circuit designated by the Government as a voice call line and transmits the voice into the circuit, whenever the circuit is activated.

User configurable VOX threshold, exhibit a voice signaling threshold of -26 dBm0 (nominal test level) and blocks responses to voice signals below the threshold of -26 dBm0 for the analog G/G interface. The ready scripts used can detect events and respond with appropriate actions with respect to the states.

The following depicts the typical Voice Call Signaling procedure simulation using MAPS™ CAS

Voice Call Signaling Message Sequence	Voice Call Recording

SS5 / ATS No.5 Signaling

MAPS™ CAS supports Signaling System No 5 Line and register signaling procedure simulation as per Q.140- Q.199. SS5 specifications. SS5/ATS-No.5 call simulation is automated with ready-to-use scripts and facilitates to add events on active calls.
ATS-No.5 is a variant of SS5 signaling system, which is used in order to Seize a line, clear a line from either calling or called user side, block a line and answer a call. Line signals use one or two tones. VCSs are able to distinguish between different line signals by keeping track of the call state during the call setup or clearing procedure. Line signals can be sent from either side of an inter-VCS link. ATS-No.5-line signals are compelled implying that each line signal sent in one direction has a corresponding acknowledgement line signal in the opposite direction.

The following call flows illustrate the SS5 Signaling procedure.

CAS SS5 Signaling Place Call	CAS SS5 Signaling Answer Call

MAPS™ CAS SS5 Signaling can place and answer call on the selected timeslot and Send or Receive Traffic as shown in the below screenshots.

SS5 Signaling Place Call	SS5 Signaling Answer Call