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| Integration Methods
Common integration methods are: LAN Interface Inband Signaling Serial Integration #### LAN Interface The LAN link allows the DEFINITY and the INTUITY AUDIX system to communicate over a private, dedicated LAN or through a customer's LAN. The LAN link provides the same functionality as a DCIU link, except the physical connection is different. #### Inband Signaling Inband integration is possible on supported switches through the use of Dual-Tone Multiple Frequency (DTMF) signaling. Strings of DTMF tones are transmitted on the analog voice channel after the channel connects to answer the call, but before the voice is cut through. Typically, the string contains the Calling Line Identification (CLI), the Called Party (CP) Identification, and the reason for the call (redirection or direct call). Dial strings for activation and deactivation of Message Waiting Indicators (MWI) are included in the protocol. Support for MWI update command strings and DTMF timings (inter-digit timing and end-of-string) is also an essential element. #### Serial Integration Serial integration is of two types: Proprietary Serial integration requires an RS-232 interface. The elements of the serial protocol are typically a superset of those in the inband signaling, with the addition of a field that describes channel information. When the call is forwarded to the system, a packet of information is sent through an RS232 standard serial cable, providing the integration data for the channel the call arrives on. Simplified Message Desk Interface (SMDI) SMDI is an integration protocol that controls the exchange of integration information through a serial interface. It is an industry standard typically used by central office (CO) switches. #### Top of page

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