13.6.13  

Call Charge Allocation and Callback 
 
If HG 1500 establishes an ISDN trunk call, the charges incurred are allocated to the station number used. As long as this physical connection exists, data can be transferred in both directions. If a connection exists between HG 1500 A and HG 1500 B via the trunk, all HG 1500 A and B devices connected to the LAN can avail of the connection. In this case, the charges are allocated to the station number of the HG 1500 A board port which established the connection.
As is standard with today's routers, call charges can only be allocated to the router station number and not to specific LAN devices or applications.
If the physical connection is cleared via "Short Hold", it is re-established when new messages are received. If this is data from HG 1500 B to A, i.e., HG 1500 B initiates the establishment of the connection, the call charging allocation also switches to B.
When the "Callback" function is activated, charges incurred by the called HG 1500 are allocated, as this called party rejects the incoming call and actively re-establishes the connection (callback without a connection). In other words, no B channel is set up. Identification is performed via the station number entered in Setup or, in the case of analog stations, via the DID number entered under "ISDN peer".
In some cases (for example when short hold is deactivated), dial-up connections can be only be initiated manually.