1. PIKA Technologies Inc. Digital Logger Application Sample April 2010

2. What is it? Sample Application developed in C++ and C# Can be used to passively record calls from Digital T1/E1 spans Works on HMP 2.8+ platforms (Windows, Linux) with PIKA Digital PCIe Boards Files can be saved in.wav or raw formats

3. Overall Architecture Description At start-up the main thread will create all the required instances. It will therefore create the digital board instance and its associated members. Each instance will communicate with the PIKA Driver (PKH_XXX) to configure and start it’s associated objects. The main thread will then spawn the event thread. The event thread is used to handle asynchronous events from the PIKA driver. For debugging purposes an event message logger (not to be confused with the digital logger) has been included to show events on the console and can also be injected to the PIKA Driver logs. The DigitalBoard instance contains 4 span instances and up to 2*30 calls. A particular call is associated to 1 channel for each of 2 spans. We should note that signalling channels are created but are not actually started. Each Span instance contains 1 hdlc and up to 30 channels.

4. Getting Started Install the PIKA Low Level HMP API on a PC ( 2.8.x or newer ) as described in the Getting Started Guide Remove the line jumpers on the PIKA HMP PCIe digital board. Install the board in the PC Cabling - requires some specific wiring Download, Compile, and run the Digital Logger application

5. Sample Code - Overall Architecture At start-up, the sample application will statically create all of the resources needed to Passively Record on all channels and spans The event thread handles asynchronous events from the PIKA driver. For debugging purposes an event message logger (not to be confused with the digital logger) has been included to show events on the console and can also be injected to the PIKA Driver logs. There are multiple debug levels that can be controlled via a compile flag. A 4 span board can log 2 T1 or E1 connections Each Span uses an HDLC to capture ISDN messages and via the PIKA Low Level API, these messages get sent to the application for processing.

6. Overall Architecture Description The Hdlc instance is used to handle incoming ISDN Q.921/Q.931 messages. When a valid Q.931 message is decoded (cisdntranscoder.cpp), the channel detected shall setup a call. The call will then start listening to the conference between the 2 previously associated channels and output the conversation to a file. The filename will have the following format: Board_#_Call_#_$date$.extension When a ISDN Disconnect or Release message is detected, the audio file will be saved and closed. It is also possible to copy the audio buffers to the application. This can then be used to listen to the conversation in a live session.

7. Digital Logger API Application thread Diagram Main Application Digital Logger Event Thread PIKA Driver Spawn Thread PKH_BOARD_XXX PKH_SPAN_XXX PKH_CHANNEL_XXX Application Event Thread DL_Initialize DL_SetCallAudioBufferCB Spawn Thread DL_SetCallAudioBufferCB DL_WaitOnEvent DL_WaitOnEventSerialized Audio function CB DL_Start DL_Stop DL_Cleanup PKH_ Wait On Event

8. Using the Digital Logger API There are different APIs available (for windows) 1)Compile all source into an application DL_XXX : include digitallogger.h 2)Compile application with DLL PKDL_XXX : include DigitalLoggingDll.h 3)Compile application in C# Use namespace DigitalLogger in DigitalLogger.cs

9. API call scenario Main Application thread DL_Initialize(tApplicationConfiguration config) // Initialize system DL_SetCallAudioBufferCB(Pf_callAudioBufferCB func) // Set callback if you want to listen to live audio Create an event thread and call DL_WaitOnEvent(PK_UINT timeout, tApplicationEvent *event) DL_Start() // Start the system A Call is triggered from the CO Application Event Thread DL_WaitOnEvent returns EVENT_CALLSETUP, SpanId1 specifies the span origin DL_WaitOnEvent returns EVENT_CALLCONNECT Digital Application Wrapper The call will be recorded in an audio file The Audio Buffer Call Back will the called with the audio buffer The Call is hung up Application Event Thread DL_WaitOnEvent returns EVENT_CALLRELEASE Digital Application Wrapper The recorded file is closed Main Application thread DL_Stop() // Stop the system Stop Application thread DL_Cleanup // Cleanup the system

10. DigitalBoard Class Hierarchy and containment Span Channel Hdlc Call BaseEntity LogClient Logger (singleton) 1 4 1 1 30 2*30 System 1 n

11. Passive Logging 1 0 2 3 HDLC Media Processing Passive Logging – Application Call Logs Audio Files Process ISDN Messages PKH_SPAN_HDLC_X Audio Record HMP Digital Board - PCIe CO PBX T1/E1 Span RX- Tip/Ring TXRX TXRX Jumpers

12. Passive Logging Architecture CO TX RX PBX TX RX HDLC Audio MM Conf M Record File ISDN Events ISDN Events Tip / Ring

13. Passive Logging – Cabling PBX Telco TX Tip TX Ring TX Tip TX Ring RX Tip RX Ring RX Tip RX Ring RX TIP RX RING TX TIP TX RING RX TIP RX RING TX TIP TX RING Span 0 Span 1 Do No Connection Do No Connection PIKA Digital T1/E1 HMP Board - PCIe

14. Call/Span/Channel allocation 0123 2828 2929 3030 3131 Span 1 0123 2828 2929 3030 3131 Span 2 0123 2828 2929 3030 3131 Span 3 0123 2828 2929 3030 3131 Span 4 0 32 Call Ids 1 33 2 34 3 35 28 60 29 61 30 62 31 63

15. Where can I find it? The Source code is located under: http://svn.pikatech.com/customercare/trunk/samples/DigitalLogger/ Some additional info: http://forum.pikatechnologies.com/showthread.php?t=170./docs/README.rtf