Modem Manager Service
The VTScada Modem Manager provides data and voice telephony services for standard VTScada applications.
TAPI - Telephony Application Programming Interface. A component of Microsoft operating systems. The TAPI interface enables the connection of a PC running Windows to telephone services. The TAPI standard supports connections by individual PCs, as well as LAN connections serving many computers. Within each connection type, TAPI defines standards for simple call control and manipulating call content.
The Modem Manager provides services that allow modems connected to different machines to be managed as a common pool.
Key features of the Modem Manager are:
- Able to control a pool of modems distributed across a number of PCs. Any combination of your modems may be included in or excluded from a given pool. Within a pool, each modem is tried in turn until a call is successful.
- One more modems can be set aside from the pool, to be used as a preferred route for outgoing calls.
- Provides control over which modems should be used, and when calls should be made.
- Call setup, queue information, and progress information are distributed to all copies of Modem Manager on a networked system.
- Queues and timekeeping use UTC for coordination of modems across multiple time zones.
- Provides generic audio call handling facilities, including guard tone, DTMF detection, and speech synthesis.
- Provides a way for you to list the modems in your system.
- Trihedral provides both a TAPI Service Provider (TSP) and a modem audio driver. These have been developed to overcome limitations that were found in the standard Unimodem V driver from Microsoft.
The Modem Manager interfaces with a Microsoft system component called "TAPI" (see definition box). TAPI enables different modems to be handled in a generic manner, and to be shared between different applications and services (e.g. RAS or FAX). TAPI does not interface directly to the modem since this is the job of the Trihedral Voice Modem Service Provider. You may use the more common Unimodem V, but a Trihedral driver was developed to avoid several problems that have been found with the Unimodem V driver.
Physical modems are associated with modem tags. These hold the configuration details for each modem, and may be monitored for call progress or errors.
Modem Tags - Configuration of.
