ZyXEL Communications Omni TA128 - Manual (Page 38)

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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-Layer-
Compatibility, 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