Abstract:
A method and a system that will allow a hearing impaired person to access a TRS (Telecommunications Relay Service) center via an Internet terminal on the World Wide Web instead of using a TTY device on the telephone network. The present invention represents a modification or add-on to the methodology and systems currently employed by TRS centers throughout the country. Therefore, a TRS center will be able to handle operator assisted relayed telephone calls both using the present POTS (Plain Old Telephone Service) and the World Wide Web. Additional equipment will be required for a center to implement the present invention, said equipment comprising a TRS Packet Server and a router connected to the internet. When a hearing impaired customer wishes to place a call, secured communication is first established over the internet with a Nationwide TRS Routing Server. The Nationwide Routing server then finds a TRS center to handle the call. Once the center has been selected and an operator from that center has been assigned to the customer, further communications from the customer is directly with the TRS Center. A relayed telephone call is handled by the hearing impaired customer using received and transmitted text in an internet chat window where the customer and the operator type their respective conversation. The same relayed telephone call with the hearing party is handled by voice conversation with the operator.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This is a non-provisional counterpart and claiming benefit of U.S. Provisional Application Ser. No. 60/424,164, filed Nov. 6, 2002, said provisional application being incorporated in its entirety herein by reference. 
    
    
     BACKGROUND OF INVENTION 
     The Americans for Disabilities Act of 1990 requires that any company providing inter-exchange telecommunications services must provide access to people with disabilities. This law requires that all telephone companies in the United States and its possessions must provide access to people with disabilities including those that are deaf, hard of hearing and speech impaired. All states are required to establish TRS (Telecommunications Relay Service) for these individuals. Essentially, TRS connects those who can hear and speak with those who can&#39;t via the telephone network. 
     Typically, a person who is deaf, hard of hearing or speech impaired accesses TRS with a device known as a TTY (Teletype Device) or TDD (Telecommunications Device for the Deaf). TTYs have a single or multiple line display with a keyboard and a modem to connect to a telephone line. Deaf individuals have communicated with each other over the telephone network since the late 1960s with these devices. Communications with these devices are accomplished by typing on a keyboard and have the words appear on the TTY displays of both parties. Some TTYs have a printer attached to allow printing of the conversation. 
     TRS centers bridge the gap between people with TTYs and those who use telephone sets (POTS) to communicate over the telephone network. A TRS center is a call center that has from ten to hundreds of relay operators, know as Communications Assistants (CA). These CAs each work at a terminal and receive calls from TTY users requesting to call a person with normal speech and hearing (voice person). The CA will place calls for these individuals and relay the exact conversation. In other words, the CA will read the text received from the TTY user to the voice person and type the response from the voice person back to the TTY user. A CA can also receive a call from a voice person who desires to call a person with a TTY. 
     TRS users access the TRS by dialing a toll free number or by dialing  711 . Each state either has its own TRS center or contracts with a center in another state to handle TRS traffic. The cost to operate these centers are normally paid for by the companies providing inter-exchange telephone services in that state. 
     The present invention is a method and a system that will allow a person to access a TRS center via an Internet terminal on the World Wide Web instead of using a TTY device on the telephone network. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic of a current typical TRS operator platform. 
         FIG. 2  is a schematic of a current typical TRS center. 
         FIG. 3  is a schematic of a typical TRS center that would use the present invention. 
         FIG. 4  is a schematic of the internet server. 
         FIG. 5  is a message flow diagram showing the interaction between the customer&#39;s internet terminal, the nationwide routing server, and the TRS center packet server. 
         FIG. 6  is a flowchart for the customer&#39;s terminal application. 
         FIG. 7  is a flowchart for the nationwide routing server application. 
         FIG. 8  is a flowchart for the TRS center packet server application. 
         FIG. 9  is a flowchart for the TRS operator&#39;s application. 
     
    
    
     DETAILED DESCRIPTION 
     The diagram of a conventional CA operator platform is shown in  FIG. 1 . Notice that there are two analog telephone line connections. One is used for the incoming caller and one is used for the outgoing caller. These connections need to be analog as opposed to digital because a modem connection to the telephone line will be required. A typical current TRS system diagram is shown in  FIG. 2 . This shows how the position is connected to a PBX. Typical call flow is as follows:
         The CA logs into the platform and sets status as available to take calls.   The position is registered in the PBX as available and put in the queue to accept calls.   Customer dials an 800 number for the PBX and arrives at the PBX via the PSTN.   Call is routed to the next available CA in queue via an incoming analog telephone line to the CA&#39;s platform.   The CA obtains the calling-to number from the customer.   The CA dials the calling-to number and begins relaying the conversation.       

     Internet Access capability can be added to the TRS center by installing the additional equipment shown in  FIG. 3 , i.e., a TRS Packet Server and a router connected to the internet. In addition, modifications to the software on the TRS Operator Platform will be required to communicate with the new TRS Packet Server. Typical call flow for a TRS call arriving through Internet Access will be the same as discussed above but with the following additions:
         The CA position logs into the TRS Packet Server at the same time it logs into the PBX.   The position will also be put in queue in the TRS Packet Server.   When a call request arrives at the Packet Server, a call arrival message will be sent to the next available CA position via the LAN.   If the position has not received a call via the PBX, a call accept message will be sent back to the Packet Server and at the same time the CA position will issue a make busy command to the PBX. The position will now process the TRS call for the internet customer.   If the position has received a call while in queue at the PBX, a cancel call command will be sent to the Packet Server. The Packet Server will then select another CA position and send a new call arrival message to the position.       

     It is important to note that the criteria for selecting a position to receive a call in the Packet Server should be different then that in the PBX. Most PBXs use a selection process known as most idle selection. That is, position that is logged into the PBX queue for the longest amount of time without receiving a call receives the next call. The Packet Server will also maintain a queue of available positions. If a call arrives at the PBX via the PSTN and a call arrives via the Packet Server at the same time, it is possible for the same CA position to be selected by both the PBX and Packet Server to receive the calls. In order to minimize this possibility, the threshold in the Packet Server queue should be set to a higher level than the PBX queue. 
       FIG. 4  shows a diagram on how multiple TRS centers can be connected to the Internet. One Nationwide TRS Routing Server will receive call requests from special software installed on customer&#39;s Internet terminals. This call request is a TCP packet that will contain as a minimum the following information: the customer&#39;s IP address, the number the customer wants to dial through TRS (calling-to number) and customers account number. The Routing Server will then assign this customer a serial number and the select a TRS center based on the calling to number and send a call request packet to the Packet Server at that center. This packet will contain the customer&#39;s serial number. If there are operators available to take calls at that center, a call-accept message will be sent back to the Routing Server with the customer&#39;s serial number, the IP address and TCP port of the routing server will be included for the customer to establish connection on. This information will then be forwarded back to the requesting customer. At this point the customer&#39;s software will send the call request packet directly to the TRS Packet Server using the IP address and TCP port information contained in the call accept packet. A secure connection will then be established using SSL or some other encryption method. A CA position will be selected and the TRS call can then proceed. A diagram of the message flow is shown in  FIG. 5 . The total from when the customer sends the call request packet to the Routing Server until a CA begins dialing the request should take less than three (3) seconds if there are CAs available in queue to take the call. 
     Referring to  FIG. 5 , the flow is as follows: 
     1. The customer establishes a secure connection to the Nationwide Routing Server. 
     2. The Nationwide Routing Server responds with an acknowledgment that a secure connection has been established. 
     3. The customer issues a request for a TRS Operator to dial a number and initiate a telephone call. 
     4. The Nationwide Routing Server queries the data base for the appropriate TRS Center based upon where the call is to be placed. For example, if the customer wishes to dial a number in New York City, the Nationwide Routing Server designates the New York center. Typically, a single center handles several states. This step is shown in  FIG. 7 . 
     5. The Nationwide Routing Server queries the specific TRS Packet Server (e.g., New York) to determine whether an operator is available to place the call. If no operator is available, then optionally: 
     a. Another center can be queried; or, 
     b. An ALL OPERATORS BUSY message can be sent to the customer. 
     6. If an operator is available, the TRS Packet Server informs the Nationwide Routing Server that the TRS Center is prepared to accept the call, and an operator is assigned. 
     7. The Nationwide Routing Server informs the customer that the call is ready to proceed. The call-accept packet has the IP address of the chosen TRS Packet Server and the position number of the chosen operator. 
     8. A direct secure encrypted duplex connection is established between the customer and the chosen TRS Packet Server. At this time, the customer no longer communicates with the Nationwide Routing Server for this call. 
     9. The customer issues a formal request to dial a number. 
     10. The TRS Packet Server acknowledges that the call has been dialed. It reports back to the customer with a RINGING, BUSY, or INVALID (NOT IN SERVICE) message. 
     11. If the called party answers, the relay call is processed between the customer (who types his responses) and the hearing party (who speaks). The operator mediates between the two parties by speaking to the hearing party and typing responses to the customer. 
     12. When the call is complete, the customer issues a HANG-UP request. 
     13. The TRS Packet Server acknowledges HANG-UP to the customer. 
     In a typical application, the customer uses a conversation window not unlike that of a typical chat or instant messaging application. In fact, the software can be integrated with AOL Instant Messaging Software since the entry points and interface specifications are publicly known. 
     There are four software components to this system:
         The Customer&#39;s Internet Terminal Application   The Nationwide Routing Server Software   The TRS Packet Server Software   The TRS Operator Platform Software       

     Each of the components are linked together by an IP (Internet Protocol) connection. This section provides a functional specification for each software component. 
     Customer&#39;s Internet Terminal Software: 
     The Customer&#39;s Internet Terminal Software is a custom application that resides on the customer&#39;s Internet Personal Computer. This application is essentially a text box that allows the customer to communicate with a TRS Operator once the connection has been established to the TRS Packet Server. A summary of the TCP messages handled are shown in the tables below. 
     
       
         
               
             
               
               
               
             
           
               
                   
               
               
                 Receive Packets 
               
             
          
           
               
                 Message Type 
                 Received From 
                 Description 
               
               
                   
               
               
                 Nationwide Secure 
                 Nationwide Routing 
                 Confirmation of secure 
               
               
                 Connection Established 
                 Server 
                 connection 
               
               
                 TRS Server Secure 
                 TRS Packet Server 
                 Confirmation of secure 
               
               
                 Connection Established 
                   
                 connection 
               
               
                 Call Accept Packet 
                 Nationwide Routing 
                 Call has been placed to 
               
               
                   
                 Server 
                 a TRS Operator and 
               
               
                   
                   
                 the TRS Operator has 
               
               
                   
                   
                 dialed the outbound 
               
               
                   
                   
                 party 
               
               
                 TRS Operator Data 
                 TRS Packet Server 
                 Contains information 
               
               
                   
                   
                 text typed by the 
               
               
                   
                   
                 TRS Operator 
               
               
                 Log Off Acknowledgement 
                 TRS Packet Server 
                 The outbound party 
               
               
                   
                   
                 has hung up. 
               
               
                 Acknowledgement 
                 TRS Packet Server 
                 Acknowledgement 
               
               
                   
                   
                 packet 
               
               
                 Error Packet 
                 TRS Packet Server 
                 Error condition 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
             
           
               
                   
               
               
                 Transmit Packets 
               
             
          
           
               
                 Message Type 
                 Sent To 
                 Description 
               
               
                   
               
               
                 Establish Secure 
                 Nationwide 
                 Establish Secure Connec- 
               
               
                 Connection to the 
                 Routing Server 
                 tion to Nationwide 
               
               
                 Nationwide Routing Server 
                   
                 Routing Server 
               
               
                 Call Request 
                 Nationwide 
                 Originate a call 
               
               
                   
                 Routing Server 
               
               
                 Establish Secure 
                 TRS Packet 
                 Establish a secure connec- 
               
               
                 Connection to a TRS 
                 Server 
                 tion to the TRS Packet 
               
               
                 Packet Server 
                   
                 Server 
               
               
                 Dial Request 
                 TRS Packet 
                 Initiate a call to an out- 
               
               
                   
                 Server 
                 bound party 
               
               
                 Customer Data Packet 
                 TRS Packet 
                 Customer-typed conversa- 
               
               
                   
                 Server 
                 tion text 
               
               
                 Hang-up Request Packet 
                 TRS Packet 
                 Requests that operator dis- 
               
               
                   
                 Server 
                 connect the call 
               
               
                 Acknowledgement 
                 TRS Packet 
                 Acknowledgement packet 
               
               
                   
                 Server 
               
               
                 Error Packet 
                 TRS Packet 
                 Error condition 
               
               
                   
                 Server 
               
               
                   
               
             
          
         
       
     
       FIG. 6  is a flowchart for the customer&#39;s internet terminal software. 
     1. Upon initialization, the customer&#39;s IP address is noted, and the UI (User Interface) window is displayed. 
     2. The customer issues a dial request to the Nationwide Routing Server. 
     3. If an error occurs, the customer has the option to either hang-up or to try again. TERMINATE is when the customer aborts the operation or is otherwise disconnected. 
     4. TIME-OUTs occur when the customer takes too long to perform a certain task. These typically issue an error message, and requires the customer to reissue the dial request to the Nationwide Routing Server. 
     5. The customer establishes a secure connection with the Nationwide Routing Server, issues a call request, and receives a call accept packet. 
     6. The customer establishes a secure connection with the designated TRS Packet Server. The Nationwide Routing Server will no longer communicate with the customer unless there is a TIME-OUT. Once this connection is established, the dial request and call accept packet is transferred to the TRS Packet Server. 
     7. Once the call is in progress (i.e., the hearing party answers the phone), the customer&#39;s terminal is able to communicate with the operator by sending and receiving text. 
     8. When the call is complete, a HANG-UP request is issued, and a HANG-UP acknowledgment is received. 
     9. The customer now has the option of placing a new call without going back to the Nationwide Routing Server. 
     Nationwide Routing Server Software: 
     The Nationwide Routing Server Software simply provides a means to inform the Customer&#39;s Internet Terminal Application if there are any operators available to handle a call. It queries the various TRS Packet Servers at the TRS centers and finds the customer an available TRS Operator. If no operators are available an error message is sent to the customer to inform them that no operators are available and try back later. 
     
       
         
               
             
               
               
               
             
           
               
                   
               
               
                 Receive Packets 
               
             
          
           
               
                 Message Type 
                 Received From 
                 Description 
               
               
                   
               
               
                 Establish Secure 
                 Customer&#39;s Internet 
                 Request to establish a secure 
               
               
                 Connection 
                 Terminal 
                 connection 
               
               
                 Issue Call Request 
                 Customer&#39;s Internet 
                 Find an available TRS 
               
               
                   
                 Terminal 
                 Operator 
               
               
                 Call Accept Packet 
                 TRS Packet Server 
                 Agent Available 
               
               
                 Error Packet 
                 TRS Packet Server 
                 Indicates Error Condition 
               
               
                 Error Packet 
                 Customer&#39;s Internet 
                 Indicates Error Condition 
               
               
                   
                 Terminal 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
             
           
               
                   
               
               
                 Transmit Packets 
               
             
          
           
               
                 Message Type 
                 Sent To 
                 Description 
               
               
                   
               
               
                 Nationwide Secure 
                 Customer&#39;s Internet 
                 Confirmation of secure 
               
               
                 Connection Established 
                 Terminal 
                 connection 
               
               
                 Status Request Packet 
                 TRS Packet Server 
                 Confirmation of secure 
               
               
                   
                   
                 connection 
               
               
                 Call Accept Packet 
                 Customer&#39;s Internet 
                 Call has been placed to 
               
               
                   
                 Terminal 
                 a TRS Operator and the 
               
               
                   
                   
                 TRS Operator has dialed 
               
               
                   
                   
                 the outbound party 
               
               
                 Error Packet 
                 TRS Packet Server 
                 Indicates Error Condition 
               
               
                 Error Packet 
                 Customer&#39;s Internet 
                 Indicates Error Condition 
               
               
                   
                 Terminal 
               
               
                   
               
             
          
         
       
     
       FIG. 7  is a flowchart for the Nationwide Routing Server software. 
     1. Upon initialization, the Server&#39;s IP address is registered, and a UI window is displayed. 
     2. The software goes into a wait state until a secure connection request is received from the customer. 
     3. TERMINATE means that the server is shutting down. When it becomes necessary for the Nationwide Routing Server to shut down, the software waits for all threads to terminate, and then the application ends. 
     4. A thread is a specific task in a multi-tasking environment. The number of threads that may run simultaneously is hardware dependent. An individual call request represents a single thread. The lifetime of a typical thread is approximately 500 milli-seconds. However, this is dependent upon TIME-OUT parameters which represent a design choice. 
     5. Once a secure communication is established with the customer, the Nationwide Routing Server Software queries a database to locate the appropriate TRS Center. 
     6. Once the appropriate TRS Center is located, a Status Request is sent to the TRS Center Packet Server. 
     7. Once a call accept packet is received from the TRS Center Packet Server, the Nationwide Routing Server Software issues a call accept packet to the customer. 
     8. The Nationwide Routing Server&#39;s job with the particular customer is now complete, and the thread is terminated. 
     TRS Packet Server Software: 
     The TRS Packet Server Software essentially acts as a broker for messages sent between the Customer&#39;s Internet Terminal Application and the TRS Operator Platform Software. It also contains the queue of available TRS Operators and sets the queue threshold. A key feature of this system is the ability to keep several TRS Operators available to receive calls through the Public Switched Network (PBX). In order for calls placed through the Public Switched Network to receive priority, a higher queue threshold is set in the TRS Packet Server than the PBX. The following is the detail on how this system works. 
     1. A TRS Agent logs into the TRS Operator Terminal. 
     2. The TRS Operator Terminal sends a Make Available message to the PBX. This allows the TRS Operator to start receiving calls through the Public Switched Network. This step is only used for operators who are trained to handle TRS calls through the Public Switched Telephone Network. 
     3. The TRS Operator Terminal sends a Make Available message to the TRS Packet Server. This allows the TRS to start receiving calls from Internet Customers. This step is only used for operators who are trained to handle Internet TRS calls. 
     4. The TRS Packet Server will only send a new call to a TRS Operator if there are more than the threshold number of operators available in queue. Otherwise, the TRS Server will report No Operators Available back to the Nationwide Routing Server in response to a Status Request Packet. 
     5. If a PBX call is received at the position, a Position Busy message is sent to the TRS Packet Server to remove the position from the queue to receive new calls from Internet customers. 
     6. If an Internet Relay Call is received at a TRS Operator position, a Position Busy message is sent to the PBX to remove that operator position from the PBX queue. 
     7. When the TRS Agent logs out of the position, a Position Busy message is sent to both the PBX and to the TRS Packet Server to prevent the TRS Operator from receiving new calls. 
     The following tables lists the messages that the TRS Packet Server Software processes: 
     
       
         
               
             
               
               
               
             
           
               
                   
               
               
                 Receive Packets 
               
             
          
           
               
                 Message Type 
                 Received From 
                 Description 
               
               
                   
               
               
                 Status Request 
                 Nationwide Routing 
                 Requests if there are 
               
               
                   
                 Server 
                 TRS Operators Available 
               
               
                   
                   
                 above the queue 
               
               
                   
                   
                 threshold 
               
               
                 Position Available 
                 TRS Operator 
                 Place TRS Operator 
               
               
                   
                 Position 
                 Position in queue 
               
               
                 Position Busy 
                 TRS Operator 
                 Remove TRS Operator 
               
               
                   
                 Position 
                 Position from queue 
               
               
                 Establish Secure 
                 Customer&#39;s Internet 
                 Request to establish 
               
               
                 Connection 
                 Terminal Application 
                 secure connection 
               
               
                 Dial Request Packet 
                 Customer&#39;s Internet 
                 Packet is forwarded to 
               
               
                   
                 Terminal Application 
                 TRS Operator Position 
               
               
                 Customer Data Packet 
                 Customer&#39;s Internet 
                 Packet is forwarded to 
               
               
                   
                 Terminal Application 
                 TRS Operator Position 
               
               
                 TRS Operator Data 
                 TRS Operator 
                 Packet is forwarded to 
               
               
                   
                 Position 
                 Customer&#39;s Internet 
               
               
                   
                   
                 Terminal Application 
               
               
                 Hang-up 
                 TRS Operator 
                 Packet is forwarded to 
               
               
                 Acknowledgement 
                 Position 
                 Customer&#39;s Internet 
               
               
                   
                   
                 Terminal Application 
               
               
                 Acknowledgement 
                 Customer&#39;s Internet 
                 Acknowledgement 
               
               
                   
                 Terminal Application 
                 packet 
               
               
                   
                 or TRS Operator 
               
               
                   
                 Position 
               
               
                 Error Packet 
                 Customer&#39;s Internet 
                 Error condition 
               
               
                   
                 Terminal Application 
               
               
                   
                 or TRS Operator 
               
               
                   
                 Position 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
             
           
               
                   
               
               
                 Transmit Packets 
               
             
          
           
               
                 Message Type 
                 Sent To 
                 Description 
               
               
                   
               
               
                 Status Reply 
                 Nationwide 
                 Reports number of 
               
               
                   
                 Routing Server 
                 available operators 
               
               
                   
                   
                 above the queue 
               
               
                   
                   
                 threshold. 
               
               
                 Call Accept Packet 
                 Customer&#39;s 
                 Informs customer that 
               
               
                   
                 Internet Terminal 
                 call has been placed. 
               
               
                   
                 Application 
               
               
                 Secure Connection 
                 Customer&#39;s 
                 Confirms that a secure 
               
               
                 Established 
                 Internet Terminal 
                 connection has been 
               
               
                   
                 Application 
                 established 
               
               
                 Log-off Acknowledgement 
                 Customer&#39;s 
                 Confirms that out- 
               
               
                   
                 Internet Terminal 
                 bound party has hung- 
               
               
                   
                 Application 
                 up 
               
               
                 Customer Data Packet 
                 TRS Operator 
                 Packet is forwarded to 
               
               
                   
                 Position 
                 TRS Operator Position 
               
               
                 TRS Operator Data 
                 TRS Operator 
                 Packet is forwarded 
               
               
                   
                 Position 
                 to TRS Operator 
               
               
                   
                   
                 Position 
               
               
                 Acknowledgement 
                 Customer&#39;s 
                 Packet Acknowledge- 
               
               
                   
                 Internet Terminal 
                 ment 
               
               
                   
                 Application or TRS 
               
               
                   
                 Operator Position 
               
               
                   
               
             
          
         
       
     
       FIG. 8  is a flowchart for the TRS Packet Server software. 
     1. Upon initialization, the IP address is registered and a Ul window is displayed. 
     2. The software processes incoming message requests. 
     3. TERMINATE means that the server is shutting down. When it becomes necessary for the TRS Packet Server to shut down, the software waits for all threads to terminate, and then the application ends. 
     4. There are three types of message requests: 
     a. status requests; 
     b. requests to establish a secure connection with a customer; and, 
     c. login requests from the Operator Stations. 
     TRS Operator Platform Software: 
     The TRS Operator Platform Software is pre-existing in the TRS Centers. In order to add Internet Access, a modification is required to process TCP packet messages between the TRS Packet Server and the TRS Operator Platform Software. The following tables lists the new messages that the TRS Operator Platform software needs to process: 
     
       
         
               
             
               
               
               
             
           
               
                   
               
               
                 Receive Packets 
               
             
          
           
               
                 Message Type 
                 Received From 
                 Description 
               
               
                   
               
               
                 Status Request 
                 TRS Packet 
                 Requests Operator Status 
               
               
                   
                 Server 
               
               
                 Establish Secure 
                 TRS Packet 
                 Request to establish a secure 
               
               
                 Connection 
                 Server 
                 connection 
               
               
                 Dial Request Packet 
                 TRS Packet 
                 Contains the phone number that 
               
               
                   
                 Server 
                 the customer is requesting the 
               
               
                   
                   
                 TRS Operator to dial 
               
               
                 Customer Data Packet 
                 TRS Packet 
                 Contains information or conver- 
               
               
                   
                 Server 
                 sation text typed by the customer 
               
               
                 Hang-up Request 
                 TRS Packet 
                 Customer Requests that Operator 
               
               
                 Packet 
                 Server 
                 Disconnects the outbound party 
               
               
                 Acknowledgement 
                 TRS Packet 
                 Packet Acknowledgement 
               
               
                   
                 Server 
               
               
                 Error Packet 
                 TRS Packet 
                 Checksum or other error infor- 
               
               
                   
                 Server 
                 mation 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
             
           
               
                   
               
               
                 Transmit Packets 
               
             
          
           
               
                 Message Type 
                 Sent To 
                 Description 
               
               
                   
               
               
                 Status Reply 
                 TRS Packet 
                 Reports Operator Status 
               
               
                   
                 Server 
               
               
                 Position Available 
                 TRS Packet 
                 Places the TRS Operator Position in 
               
               
                   
                 Server 
                 queue to receive calls 
               
               
                 Position Busy 
                 TRS Packet 
                 Removes the TRS Operator Position 
               
               
                   
                 Server 
                 from the queue to receive calls 
               
               
                 Secure Connection 
                 TRS Packet 
                 Confirms that a secure connection is 
               
               
                 Established 
                 Server 
                 established 
               
               
                 Call Accept Packet 
                 TRS Packet 
                 Confirms that the outbound party&#39;s 
               
               
                   
                 Server 
                 number has been dialed by the TRS 
               
               
                   
                   
                 Operator 
               
               
                 Outbound Customer 
                 TRS Packet 
                 Contains the conversation text of the 
               
               
                 Data Packet 
                 Server 
                 outbound (voice) customer typed by 
               
               
                   
                   
                 the TRS Operator 
               
               
                 TRS Operator Data 
                 TRS Packet 
                 Contains information text typed by 
               
               
                   
                 Server 
                 the TRS Operator 
               
               
                 Log-off 
                 TRS Packet 
                 The outbound party has been released 
               
               
                 Acknowledgement 
                 Server 
                 by the TRS Operator 
               
               
                 Acknowledgement 
                 TRS Packet 
                 Packet Acknowledgement 
               
               
                   
                 Server 
               
               
                 Error Packet 
                 TRS Packet 
                 Checksum or other error information 
               
               
                   
                 Server 
               
               
                   
               
             
          
         
       
     
     The format of each packet is as follows: &lt;Message Type&gt;&lt;Checksum&gt;&lt;Data Field Length&gt;&lt;Data Field&gt; 
     The Message Type is a two-byte field that defines a unique message type. The Checksum is a four-byte hex field representing the checksum of the Data Field. The Data Field Length is a two-byte hex field representing the length of the Data Field. The Data Field is a variable length (1–255 bytes) field containing the data. 
     The checksum of the Data Field of each packet and compared against the Checksum Field of the packet. Any errors are reported back to the sender by means of an Acknowledgment message. Also, Acknowledgment messages are used to acknowledge each Customer Data Packet received by the TRS Operator Platform Software. Acknowledgment messages are also sent from the Customer&#39;s Internet Terminal Application to the TRS Packet Server Software to acknowledge each TRS Operator Data packet. 
       FIG. 9  is a flowchart for the modifications to the currently existing TRS Operator Platform software. 
     1. The operator logs onto the login screen at the terminal. 
     2. The application permits the operator to log onto the PBX at the TRS Center (the existing application) or onto TRS Packet Server (the present invention) or both (the present invention). These are two separate call queues. 
     3. If the operator logs onto both queues, he or she is able to handle calls from both. However, if a call comes in from either one of the queues, the application logs the operator off from the other queue. 
     The present invention has been successfully tested. 
     Key Advantages of the New System: 
     
         
         
           
             Public Switched Telephone Network calls to the TRS Center are given priority over Internet Relay calls by virtue of the queue threshold in the TRS Packet Server. 
             System can be added to existing TRS Relay Centers to add Internet Relay functionality. This provides a cost saving to the TRS provider 
             Operators need only log into the PBX from the TRS Operator position to handle Public Switched Telephone Network calls if they have only been trained in handling traditional TRS calls. 
             Operators need only log into the TRS Packet Server from the TRS Operator position to handle Internet Relay TRS calls if they have only been trained in handling Internet Relay TRS calls. 
             The same TRS Operator positions and equipment can handle traditional TRS calls and Internet Relay calls.