ZyXEL Omni TA 128 User Guide - Page 79

Accepting an Incoming Call

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CONNECT (Dialing is complete) Now, just pick up the phone handset and wait for the remote device to answer. 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. 67

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67
CONNECT
(Dialing is complete)
Now, just pick up the phone handset and wait for the remote
device to answer.
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.