Accepting An Incoming Call - ZyXEL Communications ACCESSING INTERNET & INTRANET omni series User Manual

Use ATDAs (ATDBs) to place a call from analog adapter 1 (analog
adapter 2)
Once the analog adapter's hook sensor detects that the telephone
device's handset is off hook, it sends a SETUP message to the ISDN
central exchange to request a connection. One B channel, if available,
will be assigned to this connection and the exchange will wait for the
dialed number to route the call. At the same time, a dial tone is
presented to the adapter port to prompt the user to dial. Both tone
and pulse dialing are accepted.
A busy tone will be heard on the handset if:
A B channel is unavailable.
The dialed number is undeliverable.
The called party is busy.
This indicates the failure of the attempt to connect. To place
another call, hang up the phone, then pick up and try again. If the
called party is being alerted, a ring-back tone will be heard.

Accepting an Incoming Call

Voice calls will be sent to one or both of the POTS ports (Phone 1
and Phone 2) when they are received. You can choose the POTS port
you want to receive calls by setting the MSN (AT&ZIn=s, as
described in the previous table) to a specific phone number, "s".
Sometimes the TA is not able to tell which POTS port to route the
incoming voice call. By default (ATS120.2=0), the TA will alert both
ports and the first available port will answer. Otherwise
(ATS120.2=1), an ambiguity resolution bit (Bit 5 of S84, or &Ln) is
used to determine the path.
AT&L0 - Phone 1 has the higher priority.
AT&L1 - Phone 2 has the higher priority.
Scenarios of an Incoming Voice Call
Handling Analog Calls (non-data) 73
Outcome