ZyXEL Omni TA 128 User Guide - Page 38
Multi auto-answering of data calls
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AT&L1 - Analog adapter 2 has the higher priority to answer a voice or voice-band-analog-data call; if analog adapter 2 is busy, the call will be routed to analog adapter 1. Multi auto-answering of data calls When an ISDN data call comes in, the TA128 can determine the protocol to be used in one of two ways: 1. By way of the information conveyed by the SETUP message (for DSS1, these include the Bearer-Capability, Low-LayerCompatibility, or High-Layer-Compatibility information elements; for 1TR6, these include the Service Indicator as well as an Additional Octet of the Service Indicator) 2. By the Multi Auto-answering process. The TA128 determines the protocol by monitoring the B channel signal sent by the calling site. With either method, the data call can be identified by the TA128 to be X.75, V.110, V.120, or PPP, MPPP Async-to-Sync conversion. If the address-matching process is again unable to tell which protocol to use, the TA128 will go into its "Multi Auto-answering Routine," by examining the B channel data pattern and hence determine the protocol to use. When alerted, the TA128 will send a RING message to the DTE in the following format: RING FM:17145522863 TO:17142630398 26