Abstract:
A method for managing callers into a conference system having a specific conferee limit for servers has steps as follow: for a first caller over the limit for a first conference server, the first caller electing a first conference, establishing a first tie line to a second conference server, and placing the first caller in a continuation of the first conference in the second conference server, for a subsequent caller over the limit, electing to join the first conference, placing the subsequent caller in the continuation in the second conference server, and for a subsequent caller electing to join a conference other than the first conference, determining that there is a listener in the first conference, moving the listener to the continuation in the second conference server, and accommodating the subsequent caller in the first conference server in the conference elected, preserving the single tie line.

Description:
CROSS-REFERENCE TO RELATED DOCUMENTS 
       [0001]    The present application is related to Indian Provisional Application E-106/224/2016/CHE, which was filed on Jun. 15, 2016, and which is incorporated herein in its entirety. It is also related to U.S. Provisional Patent Application 62/382,604, which was filed on Sep. 1, 2016, which is also incorporated in its entirety at least by reference. This application claims priority to both the Indian and the US provisional applications. 
     
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
       [0002]    The present invention is in the technology area of telephone conferencing, and pertains more particularly to expanding conference capability with multiple media servers. 
       2. Description of Related Art 
       [0003]    Media servers with software engines to conference multiple participants in one or more conferences are well-known in the art. The media server is a computer apparatus executing software that manages multiple audio feeds from and to persons participating with telephony-enabled devices in conferences. A media server is limited partly by hardware and partly by software to a maximum number of conferees, as it is the number of persons that determines the number of audio streams that must be managed and switched. When the limit of conferees is reached, it is common practice to tie in a second media server to handle the additional load. The second media server is coupled to the firsts media server by a tie line (a trunk line). If there is one additional conferee beyond the capacity of the first media server, there is need for one tie line. A second additional conference in current art requires a second tie line. 
         [0004]    What is needed is a method of managing the conferences and media streams so additional tie lines are not needed as conferees are added beyond the ability of the first media server. 
       BRIEF SUMMARY OF THE INVENTION 
       [0005]    In one embodiment of the invention a method for managing callers into a conference system having a specific conferee limit for servers is provided, comprising, for a first caller over the conferee limit for a first conference server, the first caller electing a first conference to join, establishing a first tie line to a second conference server, and placing the first caller in a continuation of the first conference in the second conference server, the tie line dedicated to the first conference, for a subsequent caller over the conferee limit for the first conference server, the subsequent caller electing to join the first conference, placing the subsequent caller in the continuation of the first conference in the second conference server, and for a subsequent caller electing to join a conference other than the first conference, determining that there is a listener in the first conference in the first conference server, moving the listener to the continuation of the first conference in the second conference server, and accommodating the subsequent caller in the first conference server in the conference elected, preserving the single tie line. 
         [0006]    In one embodiment f the method further comprises, for a subsequent caller electing to join a conference other than the first conference, determining that there is no listener in the first conference in the first conference server, determining that there is a conferee in the first conference in the first conference server, moving the conferee to the continuation of the first conference in the second conference, and accommodating the subsequent caller in the first conference server in the conference elected, preserving the single tie line. 
         [0007]    In one embodiment of the invention the method further comprises, for a subsequent caller electing to join a conference other than the first conference, determining that there is no listener in the first conference in the first conference server, and determining that there is a conferee in the first conference in the first conference server, moving the conferee to the continuation of the first conference in the second conference, and accommodating the subsequent caller in the first conference server in the conference elected, preserving the single tie line, and upon determining that all conferees in the first conference have been moved to the continuation of the first conference in the second conference server, dropping the tie line between the first and the second conference servers. 
         [0008]    Also in an embodiment, for a subsequent caller electing to join a conference other than the first conference, after the first tie line is dropped, establishing a second tie line dedicated to the conference elected by the caller, and placing the caller in a continuation of the conference elected in the second conference server. And in one embodiment, continuing to manage incoming callers by the techniques of moving listeners, and moving conferees that are in a conference for which a tie line is dedicated, such that new conference servers are added as conferee limits are reached, with a single tie line bridging conference servers. 
         [0009]    In another aspect of the invention a system managing callers in conferences is provided, comprising a first conference server having a plurality of established conferences, and a specific limit of number of conferees total that may be accommodated in all of the plurality of conferences, and a second conference server connected to the first conference server by a first tie line dedicated to a specific one of the plurality conferences. The first tie line is established in response to a first caller over the limit of conferees in the first conference server, is dedicated to the conference the first caller elects, and wherein a conference extension for the elected conference is established in the second conference server, with the first caller as a conferee, wherein for a subsequent caller electing the same conference as the first caller, the subsequent caller is placed in the conference extension in the second conference server for which the tie line is dedicated, and wherein, for a subsequent caller electing a conference other than the conference for which the tie line is dedicated, it is determined whether there is a listener in the first conference in the first conference server, and if so, the listener is moved to the conference extension in the second conference server, and the subsequent caller is accommodated in the elected conference in the first conference server. 
         [0010]    In one embodiment of the system, for a subsequent caller electing to join a conference other than the first conference, determining that there is no listener in the first conference in the first conference server, determining that there is a conferee in the first conference in the first conference server, moving the conferee to the continuation of the first conference in the second conference, and accommodating the subsequent caller in the first conference server in the conference elected, preserving the single tie line. 
         [0011]    Also in one embodiment, upon determining that all conferees in the first conference have been moved to the continuation of the first conference in the second conference server, dropping the tie line between the first and the second conference servers. In one embodiment, for a subsequent caller electing to join a conference other than the first conference, after the first tie line is dropped, establishing a second tie line dedicated to the conference elected by the caller, and placing the caller in a continuation of the conference elected in the second conference server. And in one embodiment the system further comprises continuing to manage incoming callers by the techniques of moving listeners, and moving conferees that are in a conference for which a tie line is dedicated, such that new conference servers are added as conferee limits are reached, with a single tie line bridging conference servers. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         [0012]      FIG. 1  is a diagram illustrating a single media server managing a number of conferences in current art. 
           [0013]      FIG. 2  is a diagram illustrating a second media server coupled to a first media server in current art. 
           [0014]      FIG. 3  is a flow chart illustrating a method in an embodiment of the invention. 
           [0015]      FIG. 4A  is a diagram of servers according to an embodiment of the invention. 
           [0016]      FIG. 4B  is another diagram illustrating a state in the method of the invention. 
           [0017]      FIG. 4C  is a diagram illustrating a further state in an embodiment of the invention. 
           [0018]      FIG. 4D  is a diagram illustrating a further state in an embodiment of the invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0019]      FIG. 1  is a diagram illustrating a single media server  101 , executing software  102 , and managing four conferences C 1  through C 4 , each conference having a number of conferees, a through n, in current art. 
         [0020]      FIG. 2  illustrates a circumstance wherein media server  101  has reached its limit of conferees, and a second media server  201  has been utilized to manage an excess of conferees. In  FIG. 2  there are four conferences shown as being managed by Media Server  101 , with n 1  conferees in conference  1  (C 1 ), n 2  in conference C 2 , n 3  in conference C 3 , and n 4  in conference C 4 . As described above, media server  101  is limited by a maximum number of conferees, not necessarily by the number of conferences. 
         [0021]    As an example, Media Server  101  might be limited to 100 conferees. If n 1 +n 2 +n 3 +n 4  is equal to or less than 100, Media Server  101  is adequate to the tasks, and no second media server is needed. If additional conferees join the conferences in progress until there are a total of 100, the next person who joins one of the conferences, indicated as P 101  in  FIG. 2 , will have to be accommodated in Media Server  201  for managing the audio streams. Assume that P 101  joins conference C 1 , and that puts Media Server  101  over its limit. To accomplish this enlargement of service to Media Server  201  a Tie Line T 1  is necessary to bridge conference C 1  between Media Server  101  and Media Server  201 . If yet another person P 102  joins conference C 1  that person also will be allocated to Media Server  201 , but the first Tie Line for C 1  will be adequate. 
         [0022]    Also indicated in  FIG. 2  is a circumstance wherein a third person, P 103 , has joined conference C 4  in Media Server  101 . This third person over the limit must also be allocated for media service to Media Server  201 , and in the current art a second Tie Line T 4  is now necessary, to join all of the conferees in C 4 . The skilled person will recognize that there may be more than four conferences being originally managed in Media Server  101 , and that a separate Tie Line will need to be established for every conference that is bridged between Media Servers. 
         [0023]      FIG. 3  is a flow chart illustrating a method in an embodiment of the invention for minimizing the number of media servers and tie lines in expanded service.  FIGS. 4A through 4D  are schematic diagrams illustrating state of a system of the invention at different stages in the process illustrated by  FIG. 3 . 
         [0024]    Referring now to  FIG. 3 , process flow is arbitrarily commenced at step  301 , under a circumstance that a first Media Server, noted as M 1  in  FIG. 3 , has a plurality of conferences in progress, noted as C 1  through Cn, and under a circumstance that the number of conferees total in all of conferences C 1  through Cn, in progress, is exactly at the limit, example 100, for the capability of the first Media Server. This circumstance is illustrated by server  401  in  FIG. 4 , with ongoing conferences C 1 , C 2 , C 3  and C 4 . 
         [0025]    At step  302  a new conferee calls in to join one of the conferences. This new caller is one more than Media Server  401  can serve, designated P 101 , so will have to be accommodated in a second media server  403 . Let us assume, for illustration, that the new caller is calling for conference C 4  in Media Server  401 . Consequently, a tie line T 1  is established to Media Server  403  (M 2 ), and caller P 101  is accommodated in an extension of C 4  in M 2 , as illustrated in  FIG. 4A . 
         [0026]    In the technical field of conference bridges, servers and software for managing conferencing, a relatively large number of conferees may be engaged in conferences at any one time. It is common practice to manage conferees in different modes, one of which is a full-service mode, such that a conferee in full service mode may hear all other conferees in a particular conference, and may speak to all of the other conferees. Another mode which may be practiced is Listening mode, in which a conferee may hear one or more other conferees, or all other conferees in a conference, but cannot participate by speaking. 
         [0027]    Now, at step  304  another caller, designated P 102 , dials in to join one of the conferences in Media Server  401 . This next caller may be asking to join the same conference C 4  as the first new caller, but it may well be a different one of the conferences in progress. If the second new caller wants to join the same conference as the first new caller, then that caller may be accommodated in M 2 , Media Server  403 , along with the first new caller, without adding a second tie line. This circumstance is also shown in  FIG. 4A  with both P 101  and P 102  together in an extension of whatever conference they both elected to join. There is, at this point, no need for a further tie line. 
         [0028]    Now let us assume the second new caller, P 102 , wants to join a different conference in progress in Media server  401  than the conference elected by the first new caller P 101 , assume C 2 . In an embodiment of the invention, instead of accommodating this additional new caller P 102  in Media Server  403 , and establishing a second tie line for conference C 2 , which would then be bridged between the two media servers, in this embodiment control goes to step  305 , and it is determined whether there is a conferee in listening mode (listener) in conference C 4 , the conference for which a tie line has been established to M 2 , Media server  403 . If there is a listener in conference C 4 , that listener is moved to the C 4  extension in second Media Server  403  (M 2 ), as noted in step  306 . This frees up one position in the first media server for the new caller in conference C 2  in Media Server  401 , so there is no need to put the new caller in the second Media Server or to add a Tie Line for C 2 . This circumstance is shown in  FIG. 4B , where C 4  (Listener) is now in the C 4  conference extension in Server  403 , and the second new caller P 102  is connected in C 2  in Server  401 . We have had two new callers, the second new caller in two different circumstances, and we still have but one tie line. 
         [0029]    In the circumstance wherein a listener is moved from C 4  to Server  403 , the system in step  307  listens for a next caller, back to step  304 . This next caller is designated P 103 , wants to join one of the conferences in first Media Server  401 , and that conference elected is not C 4 , but for another conference, say C 3 . At the same time, SW  402  continues to monitor total conferees in Media Server  401 . If one or more drop out, then spaces are freed. 
         [0030]    Considering new caller P 103 , if at step  305  there is no further listener found in the conference C 4  for which the first Tie Line has been established (NO), in step  308 , the system checks if there are conferees left in that conference, that is, is the conference still in progress with two or more conferees? If yes, then a conferee in the conference for which the Tie line has been established (our example assumes C 4 ) is moved to the second media server at step  309 . In  FIG. 4C  this moved conferee is designated C 4  (Moved). The control goes back to step  307  looking for a next caller. At this point, there have been three new callers, over and above the 100-conferee limit for Server  401 , and there is still need for just the one tie line to Server  403 . This process may continue, under fortuitous circumstances through a substantial number of new callers while avoiding a need for a second tie line, in embodiments of the invention. 
         [0031]    Consider now a new caller P 104 , wanting to join a conference, say C 1 . Consider that in this circumstance there a no listeners in C 4  to move to Server  403 , and at step  308  there are no conferees left in C 4 . In previous additions of new callers, all conferees of C 4  have been moved to Server  403 , to accommodate new callers, over the threshold of 100 callers, to accommodate the new callers in Server  401 . If, at step  308 , If there are no conferees left in C 4  in the first media server, control goes to step  310 , and the Tie Line between the first and the second media servers may be dropped, as C 4  is now managed completely in the second media server. New caller  104 , having elected to join conference C 1 , is then accommodated in a continuation of C 1  in Server  403 , and a new tie line T 2  is established for the continuation of C 1 . This circumstance is illustrated by  FIG. 4D . The process, of course continues, and additional callers over the Server  401  threshold of 100, will be accommodated as described above, by moving listeners and conferees out of C 1 , into Server  403 , and only one tie line is still necessary between Servers  401  and  403 . 
         [0032]    The skilled person will understand, given the examples described, that there are many variable circumstances, and that the process may proceed according to the flow chart of  FIG. 3  in a number of different ways, but that there will never be a need for more than one tie line between the original server and a second server tied in to take the progressive overload of the first server. In the second server, SW  404 , like SW  402 , enforces the operating parameters described, and a third and successive servers may be tied in, but that there will never be a need for more than a single tie line between servers. 
         [0033]    The skilled person will realize that these novel steps may be followed to ensure that no more than one tie line need be established between any two Media Servers. The skilled person will also realize that the steps may be done perhaps in another order, and that there are alternative ways to accomplish the novel process without departing from the scope of the invention. The invention is limited only by the claims below.