Donjin’s Keygoe series of multimedia switches are communication platform which can handle almost all types of voice, video applications in any size. While the entry level KeyGoe Series product Keygoe1000 starts with 1 channel and can be increased to 240 channels, and high end KeyGoe Series like KeyGoe 3000 has up to 127 E1 lines.

KeyGoe Donjin Multimedia Switch

All KeyGoe Series products support all types of available telecom protocols like ISDN PRI, SS7, IP ( RTP, H.323 etc). So, a KeyGoe series of product is almost future proof which will never go obsolete. Keygoe series multimedia switches are independent rack 19″ rack-mountable.

In their voice resources, they support all types of CODEC, play audio files of many formats like WAV, ADCPM, Dialogic VOX format. They have inbuilt echo-cancellation, AGC ( automatic gain control), full duplex audio playing and recording. They have VAD ( Voice Activity Detection) as well as CNG ( Comfort Noise Generation).

KeyGoe series products provide 1:1 conference facility for all voice resources. They have built in FAX resources too.

They support Windows Operating System, Linux ( Kernel Version 2.6 and above) and have SDK with many sample codes in C++, C#, Delphi.

The installation and configuration is also quite easy with visual tools to configure various parameters.

KeyGoe Series products are very feature rich, low cost but performs very well. All types of IVR applications as well as telecom solutions can be provided using KeyGoe series of products. Developing Voice applications, Conference application, FAX applications are quite easy using Donjin KeyGoe products.

Donjin support has improved a lot over the time and they have now a big number of installation in India. KeyGoe series products are being used in Hosted IVR solutions, Voice based Value Added Services, Hosted Conference Services as well as hosted Outbound IVR ( Bulk Voice Calling).

KeyGoe series products from Donjin are available at Sunshine Telesoft (P) Limited. in India.

I keep getting feedback/inquiries from various people asking about prices of CT(Computer Telephony) boards in India. Many people seem to quite puzzled to learn huge price ranges for similar boards with similar basic functionality. For example, depending on the manufacturer, one entry level model of one PRI ( E1) with 30 channels may cost anywhere between Rs. 10,000/- to Rs. 180,000/-.

Here is a price comparison :

CTI Board Street Prices in India

Though, I am unable to list prices of some other vendors here as well as CT boards with various capacities/configurations, but I hope the above list would be quite indicative. Dialogic with highest price tags still has the largest market share in a price sensitive market in India.

So, why is the price between the lowest and the highest CT Board is almost 10 times ? After all, a CT board is not ‘end product’ itself and it requires IVR applications or voice applications to provide the final solution.

Previously Chinese manufactured products were thought to be cheaper than products manufactured in other countries. But, Sangoma is Canada based company. Most probably, the basic difference between Sangoma and other boards is, Sangoma boards use processing power of HOST computer while other boards have on-board DSP ( Digital Signal Processors) to process various telecom protocol related functions. Many might argue that, with increasing MIPS in PCs, one should really not bother much about HOST PC processing for the CT boards too.

When one compares price of Dialogic boards with other cheaper cousins, one may wonder how can Dialogic survive in any price sensitive market ? I think here are the reasons :-

1. Dialogic has a huge developer base all around the world. After all, it is the oldest and biggest CTI company after merging with all its nearest rivals. It has very well documented APIs for all computer operating systems and lot of documentations available in internet for beginners.

2. Many RAD tools like VBVoice, OmniVox3D, Osidial etc. supports only Dialogic boards.

3. Most probably, Dialogic has the best support in CTI industry at present. They have very good support for both installation as well as developers.

The other cheaper alternatives like Sangoma, Digium etc. uses open source platform like Asterisk which has large developer community on net and growing. But, with almost 90% PCs in the world running on Windows Operating System, support of Windows is definitely a plus and with many RAD tools providers are surely competing well with Asterisk. For example, VBVoice is a toolkit which uses .NET! Now there must be millions of .NET developers in the world and when they find out VBVoice, they all become IVR developers overnight ( almost) and loyal fan of Dialogic boards as well.

Many people who are interested in IVR system, back out once they learn about the high price of CTI boards along with IVR software. The big price differences among similar boards confuse them more.

I have also attended mails from many engineering students interested in learning/doing college projects in CTI field and whenever I tell them price of 4 port Dialogic board, they always get discouraged. And when they ask for alternatives, I explain them about Asterisk based on Linux, they again get discouraged. Not many of them want to install Linux on their PCs. Almost everyone is very happy with their Windows machines.

So, I feel, Donjin and Synway are uniquely placed with their competitive pricing, good C++ Windows Based API. They have reasonably good support for developers.

CTI (Computer Telephony Integration) Boards, Also known as CT Boards (Computer Telephony boards), is the interface between various IVR software running on the computer and the telephone network. It is normally a PC add-on boards which is installed inside PC/Server Chassis and which is connected to telecom network physically with through E1 or Analog FXO.

With introduction of VoIP communications, CTI is no longer just hardware based, it can also be software and using existing network interface cards in the server of PC. For example, Dialogic HMP 3.0 is software CTI like solution for VOIP or SIP phones. With 3G being introduced, we might see end of CTI boards!

Indian CTI market is getting crowded with new vendors now a days. Gone are the days when CTI boards mean Dialogic. We now have almost all vendors opening shop in India from all over the globe. Many Chinese companies have opened office in India and selling low cost CTI boards in price sensitive market like India.

Here are few new players which have become quite active lately in Indian market:-

1. Sangoma is a Canada based company which has 2 port analog USB based cards to 8 E1 PRI boards. They have also recently launched SS7 boards. They support Asterisk as well as has own API for developing voice applications. Alliance Infotech is their Indian distributor along with ForeMost Systems. All computations are done on the Host PC making their board sizes small. But it also increases CPU usage of the Host PC. Another disadvantage is, they do not provide Echo Cancellation and CPA ( Call Progress Analysis) as a default feature.

2. Synway is Chinese company which has large range of products beginning with 2 port analog USB boards to high density server based media gateways with 64 E1 connectivity! They have low cost, high performance and feature rich boards. They claim, they are now number one for voice logging products in India. They have products supporting both Asterisk as well as own API for developing IVR applications.

3. Donjin is another Chinese company which has analog CTI boards as well as high density KeyGoe Series of products which has 48 E1 connectivity per system! They support Dialogic APIs for their voice boards upto 8E1 which is a major advantage for them as there are many Dialogic based voice application developer in India. Their boards are feature rich as well as much cheaper than Dialogic.

4. Aculab is UK based company and they sell both CTI hardware as well as voice applications. They are not very cheap, but their boards are most suitable for voice portal applications. Recently, India has witnessed rapid growth of voice based value added service (VAS), and Aculab has potential to grow here. ForeMost Systems is their Indian distributor based in Mumbai.

5. OpenVox is another Chinese CTI board manufacturer which are Asterisk based. They have both analog and Digital voice boards. They are also very competitive. ForeMost Systems is their Indian distributor based in Mumbai.

6. AudioCodes is Israel based company which provides TDM and IP based telephony servers for value added services.

Apart from these foreign companies, there are few home grown CTI board manufacturer who provide complete solutions from CTI boards to Voice Applications. Few Indian companies who provide CTI boards are:

1. ExtendIVR : ExtendIVR is majorly known for their IVR platform ExtendIVR, but they also have CTI boards.

2. OZONTEL : Ozontel Systems, based out of Hyderabad has come out with a dual port E1 PRI CARD. It was integrated with Asterisk and comes atleast at half the price of cards which are being imported. Its manufactured within India and hence support is available for both s/w and h/w out of India.

3. Punjab Communications Limited is one of the oldest IVR companies in India which has their own CTI boards.

Though Dialogic is still the biggest CTI vendor in India, but with these new CTI companies, we can expect dominance of Dialogic will reduce and IVR users will have more choice. As per Dialogic, they will soon come out with voice products specific to India which will be aggressively priced keeping mind of these competitions.

One of the advantages of using Donjin boards is easy portability of C++ codes written for Dialogic boards to Donjin boards! It should not take more than one hour for porting C++ codes from Dialogic boards to Donjin boards. Though, recently introduced KeyGoe series of products from Donjin has totally different API than of Dialogic, but its TDMA CTI boards like DN300, DN600 etc. uses ‘similar’ API as that of Dialogic boards!

Dialogic

Donjin Boards support Dialogic API

Here is the step I used for porting Dialogic C++ codes to Donjin boards in less than an hour:-

1. Header files
Donjin SDK DJNADK is freely down loadable from Donjin website. But it does not contain header files for its LIB files! So, in order to compile your C++ code for Donjin boards, you need to include header files from Dialogic SDK and include LIB files from Donjin. Normally, Dialogic SDK files are located in Program Files\Dialogic\inc while Donjin library files are located in DJNADK\Lib. So, one has to use the correct paths for Include files and then LIB files.
Normally, the below files are needed to be referenced for compiling C++ code for Dialogic Boards
a. libdtimt.lib
b. libdxxmt.lib
c. libgc.lib
d. sctools.lib
e. libfaxmt.lib
f. libsrlmt.lib.
which are found in Lib folder of Dialogic SDK.

And for Donjin boards, the following LIB files need to be referenced :-
a. DNDxxx.lib
b. DNGC.lib
c. DNFax.lib
d. DNSRL.lib
e. DNSCTOOLS.lib
These files are found in DJNADK\Lib folder.

Once these references are made correctly, C++ code gets compiled for Donjin boards !

2. Audio file
Dialogic uses VOX files as well as WAV files for playing back audio files on its boards. While Dialogic supports 8 Bit Mono with 11KHz sampling rate, Donjin supports only 8 Bit Mono with 8KHz sampling rate. So, if your Dialogic code plays WAV files with sampling rate 11KHz, you must change all WAV files to 8KHz sampling rate. It could be a real time consuming job as each files needs to be changed one by one. I have not found any tool/software to change format of WAV files in bulk or all files in a directory yet.

So, once these two processes are complete, your IVR application written in C++ could work in Donjin boards! Many people now days prefer low cost Donjin boards to save initial investment for their On-Premise IVR solutions. The developers who have written Dialogic IVR Application in C++, they can easily port their codes to Donjin CTI boards.

I keep getting mails by various people about detecting caller id using D4PCI and Dialogic API. I remember I too had to try hard once and finally contacted Dialogic support for getting ideas how caller ID could be detected using D4/PCI analog CTI board from Dialogic. I think the same procedure should work for Donjin Analog boards as well as any kind of Analog CTI boards, for that matter.

So the steps for detecting Caller ID in D4PCI board is :

1. As soon as you detect RINGING, do not connect or answer the call. But start detecting digit using appropriate API function. For example dx_getdig();

2. Important part is the settings in DV_TPT structure which is used in dx_getdig() function. Here is how I have been configuring:

• End of DX_MAXDTMF should be configured to be length of expected Caller ID length.
• DX_MAXTIME should be configured to be delay between two rings.
• Since DTMF digits for Caller ID are sent together quickly by the PBX, one may take advantage of the option DX_IDDTIME ( Inter-digit Pause).

3. As soon as one comes out of from dx_getdig() function either because of DX_MAXDTMF,DX_MAXTIME or DX_IDDTIME, one should check if Caller ID is detected or not!

So these are the three simple steps for detecting Caller ID using D4PCI board. Here is the C++ code snippet:-

DV_TPT tpt[4];

// Allocate memory
memset( tpt, 0, (sizeof( DV_TPT ) * 3) );

/* Terminate GetDigits on Receiving MAXDTMF Digits, Interdigit Pause and MAxrime */
tpt[ 0 ].tp_type = IO_CONT;
tpt[ 0 ].tp_termno = DX_MAXDTMF;
//tpt[ 0 ].tp_length = MAXDTMF;
tpt[ 0 ].tp_length = digits; // Number of digits of expected caller ID
tpt[ 0 ].tp_flags = TF_MAXDTMF;

// Terminate dx_getdig function after 3 second Interdigit pause
tpt[ 1 ].tp_type = IO_CONT;
tpt[ 1 ].tp_termno = DX_IDDTIME;
tpt[ 1 ].tp_length = 30; // Gap in betwwen digits
tpt[ 1 ].tp_flags = TF_IDDTIME;

/* Terminate GetDigits after 8 Seconds */
tpt[ 2 ].tp_type = IO_EOT;
tpt[ 2 ].tp_termno = DX_MAXTIME;
tpt[ 2 ].tp_length = 80; // Maximum time
tpt[ 2 ].tp_flags = TF_MAXTIME;

if (dx_getdig( voiceh_handle, tpt, &(dtbuf),(unsigned short)ASYNC ) == -1 )
{
printf(“getdtmfs return 0x%X\n”, ATDV_LASTERR(pline->voiceh));

}

So here are few facts I have realised:-

1. D4PCI board ( or any analog board in that matter ) may not detect caller ID all the time completely (all the digits) all the time. It has nothing to do with the Dialogic CTI board though. The reason can be explained as below :

Normally, caller ID is presented in the form of DTMF ( Dual Tone Multiple Frequency) digits after the first ring and before the second ring.

I have observed that, some times, analog board fails to detect the first ring and detects the ring from the second ring only. It this case, any CTI application would miss the caller ID completely. Some other times, the analog board (D4PCI or equivalent analog CTI boards) would detect the ring at the end of first ring cadence which may result in missing first few caller ID digits.

So, detecting caller id perfectly using analog board may depend on PBX being used. If any one knows any better technique, it will be great to share here.

What is “on premise IVRS (Interactive Voice Response System)”?
On premise IVR system can be defined as Interactive Voice response System (IVRS) which is installed in the premise of the company who is using IVRS for providing various services to its customers. On Premise IVR systems are also known as “Legacy IVRS” which are normally developed specifically for the company, using native API functions of CTI boards. It is tightly integrated with CTI board used, PBX or telephone operator, Operating System of the machine and normally written in a well defined languages like C++, .NET C# etc.

While, hosted IVR may provide many advantages, mainly outsourcing of maintenance and low initial investment, but on premise or legacy IVR systems are going to stay, in my opinion.

1. Recurring Cost
Hosted IVR services are normally rented. So, it is a recurring cost for a company. Hosting service provider may restrict services when some call spikes take place. Unlimited calls and one time cost is more beneficial in terms of ROI for many large corporates than paying for every calls handled by hosted IVR. Many companies already maintains various computer servers and PBX systems and putting one more server ( the IVR System) is not another heavy investment.

2. Long term Operation
Can a large enterprise afford to change their customer care number overnight ? What happens when hosted IVR service provider company stops its services as it closes down? With experience of recent recession in the world where many large companies went out of business, this is a real danger now where a Hosted IVR service providers close their shop, leaving their customers high and dry. Even the companies using their IVR services may close down, but they wont be needing IVR services too, right ?

3. Control and Integration
Some facility or control may not be available on hosted IVR. For example, transferring IVR call to some person in office. It can be done free of cost with in house PBX. While it may not be at all possible in case of hosted IVR or would cost money for making the outbound IVR call. Integration with PBX gives many features to IVR application, which otherwise will not be available in a hosted IVR. Another advantage would be to access IVR generated voice recordings/complaints on local LAN quickly by many people.
On premise IVR provides complete data security, protection along with customer caller IDs!

4. IVR development Tools
Now a days, there are many IVR development tools which can be easily learned and used for creating IVR applications. So, it is not difficult to manage IVR application any more. These tools can be used to develop any IVR applications in matter of days, if not hours! So, the advantage of hosted IVR for “going live quicker” can be matched with on premise IVR systems too.

5. Initial Investment
With easy availability of low cost CTI boards like Donjin, Synway etc., the initial investment for putting up a on premise IVR is no longer a deterrent. Many Telephone companies provide ISDN leased lines for voice at low rental, making it affordable to many medium sized companies too.

Many will still prefer hosted IVR over on-premise IVR systems and choice between them would largely depend on the IVR application and usage. When number of calls remains more or less constant and data security is required, than on premise IVR systems seems a better choice.

I think, on premise IVR systems are going to stay.

There are many disadvantages of using analog CTI ( Computer Telephony Integration) cards. Apart from that, digital CTI boards offer many advantages over analog CTI boards and I would like to list three main reasons why one should upgrade to digital CTI boards from analog ones.

Even in India, E1 connectivity or PRI lines are easily available from any telecom service provider and it is much cheaper. And with, many new CTI manufacturers are offering high quality digital CTI boards which are easily available.

Here are three reasons :-

1. Dialed Number Identification ( DNI Facility)
Digital boards provide DNI ( dialed Number Identification) which is not available in analog CTI boards. DNI can be very useful. It provides options for separate CTI applications depending on the DNI detected. The same interactive voice response application could play different welcome prompts as per DNI. For example:- A digital interface with Telephone exchange may offer 30 different numbers, and one common number for all 30 lines. Now depending on caller dialing one or groups of numbers, a separate greetings, separate call flow can be implemented in the same CTI application. There would be flexibility to change, modify these numbers without having to change any physical lines.
DNI can also be used for shortcut in menu options. For example, there are 4 kinds of complaints in a company. Four separate numbers could be used for each of the complaints saving callers time to choose a complaint through menu. This can greatly increase usability of any interactive voice response system application.

2. Quick connections
Digital CTI boards uses digital protocol for quick call setup and quick information exchanges. So, any call can be connected quickly. But n analog, it order to CTI boards, one has to wait two rings before the call can be connected. Many of the times, analog CTI boards may not detect CLI at all. Any irate customer gets more irritated when her call is connected after 2/3 rings. It also saves time and handle more calls. So the throughput of digital boards is more than analog CTI boards.

3. Disconnect Problems
Analog CTI boards need to train on varius disconnect tones which may vary from one PABX to another. It takes time to setup detection of these various tones like Busy Tone, Engage Tone, Disconnect Tone, Dial Tone. Also, it takes some minimum time to detect any of these tones. So, analog CTI boards take time to dial out, disconnect.
During outbound calls, it is not easy to detect if called number has picked the call or not. Many people use here voice activity detection as ring back tone does not work with accuracy. With digital CTI boards, all these problems are removed. This not only saves time, but it increases efficiency, result in more number calls.

There is one benefit of having analog lines. out of many analog lines, if one cable is cut, remaining lines will work, in digital, it is only one wire, so one cable is cut, whole of your lines or at least minimum 30 ports would go down.

So, if you are still using analog CTI board, consider upgrading to digital CTI boards now!

I had visited India Telecom 2009 exhibition held from 3rd December 2009 to 5th December 2009 at Pragati Maidan, New Delhi, India. Though it was mainly an exhibition about Indian Telecom Industry, but I found many companies from IVR industries present there. I thought I would update about them.

These are the companies I found :-

1. Aculab
It came with CTI boards VXML interpreter. While I was visiting the stall, there were some visitors and I did not speak to anyone, did not fail to pick up their brochures. But I think, Aculab got good number of visitors.

ACULAB at India Telecom 2009 Exhibition

2. OpenVox
Among many Chinese Telecom companies in the exhibition, I never expected to see Openvox. I was looking for Miss Lily who commented about Donjin DN300 board. They were offering various IP PBX solutions based on Asterisk. I think, would start working on building PABX using Asterisk too.

OPENVOX at Indian Telecom 2009 Exhibition

3. Synway
Synway was there too with their many CTI boards. When I saw OpenVox, I was certain to see Synway too. Synway is now quite known in CTI market in India. There were many visitors when I was passing through it.

SYNWAY at Indian Telecom 2009 Exhibition

4. Alliance Infotech
I saw stall of Alliance Infotech too. It is a Indian IVR company, based in delhi and they are also reseller of Digium boards. I forgot to take a picture of their stall.

After seeing the above IVR related companies, I was hoping, I might get to see about few more too! For example Dialogic, Donjin, Pronexus with VBVoice, Invox with their IVR designer products as well as Hosted PBX, Syntellect with their Envox products. But no, they were not there!

Overall, I think, there were less visitors this time at India Telecom 2009. There were many notable absentees. Also, many stalls were empty. If the empty stalls and lesser crowd at India Telecom 2009 exhibition in crowded India with 1.2 billion population, are any indication, than, most probably, Indian Telecom industry may not be doing very well in 2009.

Donjin DN300 is equivalent of Dialogic D300-JCT board. It has one E1 connection ( RJ48 ) and 30 voice resources. Recently, I had an opportunity to test a DN300 board with our EPABX of Coral make DX2000. We used our Predictive Auto Dialer Application, written for Dialogic Digital CTI boards.

Donjin DN300 Board

1. Much like its Dialogic counterpart, it has one E1 with RJ48 connectivity for 30 voice resources and built in signaling protocols.
2. It supports ISDN PRI ( widely used now a days), R2MF. It also supports SS7 ( MTP, TUP, ISUP, SCCP) good enough for any voice portal or intelligent IVR applications.
3. It can work with any other voice boards. For example, it can work with Dialogic boards installed in the same machine. It can be very advantageous for upgrading a system with existing Dialogic boards with new Donjin boards.
4. It is quite cheaper than Dialogic equivalent board. Its market price is around Rs. 120,000/- only and if some one buys from www.ivrsworld.com, he will get another 5% discount. You may buy Donjin DN300 Board from here.

We were provided one DN300 board by Donjin India distributor Sunshine Telesoft (P) Limited, Mumbai. We used Coral DX2000 EPABX with E1 ISDN PRI (EURO) protocol.

We were also informed that it we just need to recompile our Dialogic C++ application using Library files of Donjin NADK SDK. So, first we tried to recompile our Dialogic Application! And wow, we got almost 2500 errors! On investigation, we found out that Donjin NADK does not have any C++ header files for its Library files (They use Dialogic header files only)! Also it uses different names for its Library files than Dialogic ones! Technical support team from Sunshine Telesoft has been quick enough to point me out my mistakes and correct them. And next instance, our code for Predictive Auto dialer Application were rebuilt successfully for Donjin board! It took hardly one day!

Next task was to integrate Donjin DN300 board with DX2000 EPABX! It took pretty long time but it was not fault of Donjin DN300 board, but a fault from EPABX. Finally after many days ( almost 40 days), EPABX guys could find a small programming error due to which calls were getting disconnected! Finally they agreed with our ISDN trace ( Donjin has very powerful and easy to use ISDN trace logger, unlike difficult to use Dialogic tools). Changing parameters like CRC status, Trunk mode/Network Mode in Donjin DN300 boards are quite easy compared to that of Dialogic Boards! Once Donjin DN300 with successfully integrated with DX200 EPABX, we run our application for 48 hours.

It made total 600 outgoing calls. Purposefully we made 10 destination numbers busy, 10 destination numbers which did not exist, 10 destination numbers with CRBT(Caller Ringback Tone), 10 numbers on call waiting. Donjin DN300 board could give all status 100% accurately! So we were very happy with Donjin DN300 performance.

Many people may be skeptical about quality of Donjin boards for it is being priced low or it is a Chinese product, but I did not find any problem when it worked for 48 hours. According to me, if it works for 48 hours, it could work for 48 days together. Very soon, we hope to deploy one predictive Auto Dialer System with Donjin DN300 board and would like to update this post with my experience with it.

Contact address for Donjin Boards, in India :-

Manager (Sales)
Website:www.sunshinetelesoft.com
Sunshine Telesoft (P) limited
Suite # 513, Laxmi Mall, New Link Road, Andheri (W), Mumbai, India – 400053.
Tel: +91 22 40 365 365.
Fax: +91 22 40 365 300.

An interesting IVRS Application for Voice Portal is Voice Chat Application! It can be a real revenue spinner for a voice portal if it is properly moderated, if it has feature like outbound call, background music etc.!

This chat application has two modes:
1. One To One chat
Here two users chat one through voice portal. The connection can happen both ways. User calls to voice portal number and can browse profiles of IVR Chat users and then send request for chat. If the other user is not connected to Voice Portal, voice portal makes and outgoing call to the other user and initiates the chat!

2. Group Chat/Conference ( Moderated or Operator based)
Here many people join a chat room just like in normal chat room in a website. Here a moderator approves any joining to chat room request. Moderator can block any un-parliamentarian chatter. Telephonic talk-show as well as public opinion could be generated and sampled using this kind of chat.

All calls should be recorded through a dedicated voice logger. There should be dedicated moderators. In fact, customer care of a telecom service provider could be modeled around this IVR Chat and Conferencing for better service to customer.

IVR Chat Application in a Voice Portal

Suggested Technical Arrangements :
For better operation, we recommend using a private exchange (EPABX ) for chat application. IRIS IVDX with 512 lines is good option.

Chat Server is connected to this EPABX through ISDN PRI. (easy to integrate)
Here is the tentative option technical process:
1. All calls to voice portal lands on EPABX. EPBX routes the call to Chat Server.
2. Chat Server handles the call, does the patching, OBD calls, conference calls using EPABX conference facility. Normally, this is used for one to one chat.
3. Chat Server also uses Conferencing CTI hardware to conduct its own conference as per requirement. Normally this is used to Group Chat. CTI hardware should be Dialogic or Donjin. Actually it could be any other CTI hardware, but our software supports both Dialogic and Donjin CTI hardware.
4. Moderators or Operators are connected to EPABX locally and brought to conference as per call flow.

I hope this kind of application can increase revenue of a voice portal if it is properly marketed.