Telecommunications - Configuration of X.25 Networks


Reverse Charge

reverse charge not subscribed:

calling terminal called terminal

/----------------\ /---------------\

DTE DCE DCE DTE

any terminal --- CALL -------? reverse charging not

can include the includes facility subscribed

reverse charge 0101 reverse call cleared by network

facility in a charge request

call request

?-- CLEAR 19 --

reverse charge subscribed - call cleared:

calling terminal called terminal

/----------------\ /---------------\

DTE DCE DCE DTE

any terminal --- CALL -------? -----?

can include the includes facility

reverse charge 0101 reverse

facility in a charge request

call request

?-- CLEAR 00 ---- ?-----

reverse charge subscribed - call accepted:

calling terminal called terminal

/----------------\ /---------------\

DTE DCE DCE DTE

any terminal --- CALL -------? -----?

can include the includes facility

reverse charge 0101 reverse

facility in a charge request

call request

?-- CALL ACC ---- ?-----


11.3 Reverse charge

Reverse charge acceptance is a subscription time option. If subscribed to the network will forward the INCOMING CALL packet, with the reverse charge request in the facility field, to the called terminal, which then has the option of accepting or rejecting the call in the normal way.

If the terminal requests a reverse charge call and the request is refused then the call is cleared. The requesting terminal is then charged for the call attempt.

Facility code format is:

0100 no reverse charging (default)

0101 reverse charging

note this facility code can be combined with fast select facility codes.

 

 


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