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TUCoPS :: Truly Miscellaneous :: t1.txt

T1 Signaling




type t1.hlp

OSA : Outbound Signaling bit A (to network from VRU)
OSB : Outbound Signaling bit B 
ISA :  Inbound Signaling bit A (from network to VRU)
ISB :  Inbound Signaling bit B 

------------------------------------------------------------------------------
  E&M Type 1 signaling - Feature group A, incoming call with far end release


1       ,-----------------------------------,
ISA     |                                   |			
0   ----' ''''''''''''''''''''''''''''''''' '---------------------------

1       ,-----------------------------------,			 network
ISB     |                                   |
0   ----' ''''''''''''''''''''''''''''''''' '---------------------------


1           ,------,    ,------------------------,
OSA         |      |    |                        |		
0   --------' '''' '----' '''''''''''''''''''''' '----------------------

1           ,------,    ,------------------------,		     VRU
OSA         |      |    |                        |
0   --------' '''' '----' '''''''''''''''''''''' '----------------------

    |   |   |      |    |                   |   |                      |
    0   A   B      C    D                   E   F                      G



    0-A : idle          
                
    A   : inbound network seizure       

    B   : VRU goes off-hook

    B-C : conversation

    C-D : VRU flash hook

    E   : network release indicating caller disconnect

    F   : VRU goes on-hook

    F-G : idle






















------------------------------------------------------------------------------
  E&M Type 1 signaling - Feature group B, incoming call with far end release

1       ,----------------------------------------------------,
ISA     |                                                    |
0   ----' '''''''''''''''''''''''''''''''''''''''''''''''''' '------------

1       ,----------------------------------------------------,     network
ISB     |                                                    |
0   ----' '''''''''''''''''''''''''''''''''''''''''''''''''' '------------


1           ,----,    ,----------,      ,------------------------,
OSA         |    |    |          |      |                        |
0   --------' '' '----' '''''''' '------' '''''''''''''''''''''' '--------

1           ,----,    ,----------,      ,------------------------,     VRU
OSB         |    |    |          |      |                        |
0   --------' '' '----' '''''''' '------' '''''''''''''''''''''' '--------

   |    |   |    |    |          |      |                    |   |       |
   0    A   B    C    D          E      F                    G   H       I


    0-A : idle                          
                                        
    A   : inbound network seizure       
                                        
    B-C : VRU goes off-hook

    C-D : VRU wink

    D   : connection protocol completed

    D-E : conversation 

    E-F : VRU flash hook

    G   : network release indicating caller disconnect

    H   : VRU channel goes on-hook

    H-I : idle

    Note: DTMF/MF signaling may be received from network during C-D period



------------------------------------------------------------------------------
  E&M Type 1 signaling - Feature group D, incoming call with far end release


1       ,---------------------------------------------------------,
ISA     |                                                         |
0   ----' ''''''''''''''''''''''''''''''''''''''''''''''''''''''' '-----------

1       ,---------------------------------------------------------,    network
ISA     |                                                         |
0   ----' ''''''''''''''''''''''''''''''''''''''''''''''''''''''' '-----------


1           ,----,    ,----,    ,---------------,    ,----------------,
OSA         |    |    |    |    |               |    |                |
0   --------' '' '----' '' '----' ''''''''''''' '----' '''''''''''''' '-------

1           ,----,    ,----,    ,---------------,    ,----------------,    VRU
OSA         |    |    |    |    |               |    |                |
0   --------' '' '----' '' '----' ''''''''''''' '----' '''''''''''''' '-------

   |    |   |    |    |    |    |               |    |            |   |      |
   0    A   B    C    D    E    F               G    H            I   J      K


    0-A : IDLE                          
                                        
    A   : INBOUND NETWORK SEIZURE       
                                        
    B-C : VRU GOES OFF-HOOK

    C-D : VRU FIRST WINK

    E-F : VRU SECOND WINK

    F   : CONNECTION PROTOCOL COMPLETED

    F-G : CONVERSATION TIME

    G-H : VRU FLASH HOOK

    I   : NETWORK RELEASE INDICATING CALLER DISCONNECT

    J   : VRU GOES ON-HOOK

    J-K : IDLE



    Note: may be DTMF/MF signaling from network during C-D and E-F periods






















------------------------------------------------------------------------------
 LOOP START signaling - incoming call (Note: no disconnect supervision in LS)

1
ISA
0   ------------------------------------------------------------------
							       network
1   --,  ,--,  ,------------------------------------------------------
ISB   |  |  |  |
0   ' '--'  '--' '''''''''''''''''''''''''''''''''''''''''''''''''''''


1               ,----------,    ,----------------------------,
OSA             |          |    |                            |
0   ------------' '''''''' '----' '''''''''''''''''''''''''' '--------
								   VRU
1   ------------------------------------------------------------------
OSB
0   ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

    | |  |	|          |    |                            |       |
    0 A  B      C          D    E                            F       G


    0-A : idle                          
                                        
    A   : network applies ringing to VRU     
                                        
    B   : network removes ringing

    C   : VRU channel goes off-hook

    C-D : conversation

    D-E : VRU flash hook

    E-F : conversation

    F   : channel goes on-hook

    F-G : idle







------------------------------------------------------------------------------
         GROUND START signaling - incoming call with far end release

1   ----,                                      ,-----------------------
ISA     |                                      |              
0   ''' '--------------------------------------' ''''''''''''''''''''''
							        network
1   --------,  ,--,  ,-------------------------------------------------
ISB         |  |  |  |
0   ''''''' '--'  '--' ''''''''''''''''''''''''''''''''''''''''''''''''


1                      ,------,    ,----------------,
OSA                    |      |    |                |
0   -------------------' '''' '----' '''''''''''''' '------------------
								    VRU
1   -------------------------------------------------------------------
OSB                                  
0   '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

    |   |   |  |       |      |    |           |    |                 | 
    0   A   B  C       D      E    F           G    H                 I 


    0-A : idle                          
                                        
    A   : network applies tip ground    
                                        
    B-C : network applies ringing       

    D   : channel goes off-hook         

    D-E : conversation

    E-F : VRU flash hook

    G   : network signals far end disconnect

    H   : VRU channel goes on-hook

    H-I : idle







------------------------------------------------------------------------------
                 GROUND START signaling - VRU initiates call

1              ,-----------------------,
OSA            |                       |              
0   -----------' ''''''''''''''''''''' '--------------------------
							       VRU
1   ----,      ,--------------------------------------------------
OSB     |      | 
0   ''' '------' ''''''''''''''''''''''''''''''''''''''''''''''''


1   -------,                                ,---------------------
ISA        |                                | 
0   '''''' '--------------------------------' ''''''''''''''''''''
							   network
1   --------------------------------------------------------------
ISB                                  
0   ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

    |   |   |  |                       |    |                    |
    0   A   B  C                       D    E                    F


    0-A : idle                          
                                        
    A   : VRU applies ring ground    
                                        
    B   : network applies tip ground

    C   : channel goes off-hook         

    C-D : conversation

    D   : VRU channel goes on-hook

    E-F : idle











------------------------------------------------------------------------------
          ROCKWELL D2 signaling - incoming call with far end release

1   ----------------------------------------,    ,--------------------
ISA                                         |    |
0   ''''''''''''''''''''''''''''''''''''''' '----' '''''''''''''''''''
							       network
1   --,  ,--,  ,------------------------------------------------------
ISB   |  |  |  |
0   ' '--'  '--' '''''''''''''''''''''''''''''''''''''''''''''''''''''


1               ,----------,    ,--------------------,
OSA             |          |    |                    |
0   ------------' '''''''' '----' '''''''''''''''''' '----------------
								   VRU
1   ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
OSB 
0   ------------------------------------------------------------------

    | |  |	|          |    |            |   |    |              |
    0 A  B      C          D    E            F   G    H              I


    0-A : idle                          
                                        
    A   : network applies ringing to VRU     
                                        
    B   : network removes ringing

    C   : VRU channel goes off-hook

    C-D : conversation

    D-E : VRU flash hook

    E-F : conversation

    F-G : network signals far end disconnect

      H : VRU goes on-hook 

    H-I : idle





------------------------------------------------------------------------------
          ROCKWELL D3 signaling - incoming call with far end release

1                                           ,----,
ISA                                         |    |
0   ----------------------------------------' '' '--------------------
							       network
1   --,  ,--,  ,------------------------------------------------------
ISB   |  |  |  |
0   ' '--'  '--' '''''''''''''''''''''''''''''''''''''''''''''''''''''


1               ,----------,    ,--------------------,
OSA             |          |    |                    |
0   ------------' '''''''' '----' '''''''''''''''''' '----------------
								   VRU
1   ------------------------------------------------------------------
OSB
0   ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

    | |  |	|          |    |            |   |    |              |
    0 A  B      C          D    E            F   G    H              I


    0-A : idle                          
                                        
    A   : network applies ringing to VRU     
                                        
    B   : network removes ringing

    C   : VRU channel goes off-hook

    C-D : conversation

    D-E : VRU flash hook

    E-F : conversation

    F-G : network signals far end disconnect

    H   : VRU goes on-hook 

    H-I : idle





------------------------------------------------------------------------------
                            Implementation notes:

    For all E&M and Ground Start protocals, if the VRU goes from off-hook
    to on-hook before the CO, the VRU will wait for the CO to go on-hook
    before declaring 'Hangup Complete'.

    Loop Start emulation does not provide a disconnect signal so the VRU
    will  declare 'Hangup Complete' imediately.

    Rockwell D2 and D3 protocals may provide a disconnect response to the
    VRU if the VRU hangs up first but this is not guaranteed.  Therefore
    the VRU will not wait for the release from the switch before declaring
    'Hangup Complete'.

VAX001_$ 


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