Take care to ensure accurate listing of service dependencies among TAPI
(specifically, the Telephony Service
TAPISRV.EXE), other service applications that use TAPI, and telephony service
providers (TSP) that use other services.
The installation program for the service application or telephony service
provider must record these dependencies with the Service Control Manager.
Failure to list TAPI as a dependency of the service application or failure
to list another service as a dependency of TAPI can result in the system
List "Telephony Service" as a dependency of any service application that
initializes a TAPI line or phone function. When TAPI is a dependency of a service
application, the installation program must include "Telephony Service" in the
list of service names passed to the lpDependencies
parameter of the CreateService
When another service is activated by the TSP during the service provider
startup (during TSPI_providerEnumDevices
, or TSPI_providerInit
), the service started by the TSP must be listed as a dependency of the
"Telephony Service." As a service that starts dynamically, TAPI starts all TSPs
during its startup, and it is critical for the Service Control Manager to know when
any service provider starts another service during TSP startup.
Call the QueryServiceConfig
function to determine the existing configuration of "Telephony Service,"
including dependencies. If the service or services started by the TSP are not
already included in the dependencies of the "Telephony Service", add the necessary
items to the dependency list and call ChangeServiceConfig
to update the dependencies.
For additional information about changing a service configuration, see
Changing a Service Configuration in the Microsoft Win32 Programmer's Reference.
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