ZyXEL Communications Omni TA128 - Manual (Page 115)

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DTE Port 2 Call Control
To place a call through DTE port 2, use the ATDxxxx command.
If the Calling Party Number (the original address) is required in the
outgoing SETUP message, it can be pre-stored using the
AT&ZOI=xxxx command. Once the PPP connection is
established, the TA128 will indicate the connection message with
DTE speed as follows:
CONNECT 115200 PPP
Use ATV0, if numerical result code is required. An X.75 or V.120
can be placed after selecting the protocol using ATBnn.
By default, to answer a call through DTE port 2, the MSN(or
subaddress) must have been set using the AT&ZI5=xxxx
command and the number xxxx must be matched with the Called
Party Number (the destination address) of the incoming call. The
DTE port 2 Multi-Auto function will automatically identify the
protocol of the incoming call as PPP, X.75 or V.120.
Use ATS87.7=1 to enable the TA to route data calls to DTE port 2
if DTE port 1 is busy.