Grandstream Networks HT-488, Руководство пользователя, Страница: 13 / 33

PSTN P
ASS
T
HROUGH
HT488 supports PSTN pass through using the FXS port . The user can place and receive PSTN calls
when the FXS port is in use.
•
To receive PSTN calls, pick up the phone when it rings;
•
To complete a PSTN call, press the PSTN access code (*00 is default, or any number configured
in web configuration page) to switch to the PSTN line, hear a dial tone, then dial the number.
It the HT488 looses power, it will function as a jack, enabling a direct connection to the PSTN Line.
VOIP-T
O
-PSTN C
ALLS
This function is available using the FXO port . The FXO port functions as a bridge between the Internet
and PSTN. The user can remotely use a PSTN line to initiate a call.
T
O
M
AKE A
V
O
IP-
TO
-PSTN C
ALL
:
1. Dial the FXO SIP account phone number to establish the VoIP session. The caller will hear the
ring back tone once. Then the caller hears either a special continuous tone or a dial tone. The
special continuous tone is played if the pin code is configured, otherwise, the caller will hear a dial
tone.
2. Enter the pin code (configured on the configuration page). The caller will hear a dial tone and be
connected to the PSTN line if the pin code is valid. If the pin code is invalid, the continuous tone
is played to prompt caller to enter the pin code again. The user may try up to 3 times to enter a
correct pin code. After three (3) tries, the HT488 hangs up.
3. After the caller hears a dial tone from PSTN line, the caller can place the next call.
Note:
•
Users can choose whether or not to apply password protection for VoIP-to-PSTN calls. A PIN
(Pin for PSTN calls) consists of up to 8 numeric digits and can be configured using the BASIC
SETTINGS of the web configuration page. By default, there is no password protection. (i.e. there
is no authentication required for callers on the use of PSTN line through HT488).
•
When a PIN is configured for VOIP-to-PSTN call flow, the VoIP device that calls into the HT488
FXO account needs to configure RFC2833 or SIP Info for DTMF digit transmission.
•
The special continuous tone is the prompt to enter a valid PIN code. If a caller doesn’t enter a
valid PIN, the HT488 times out after 10 seconds. Users may press the “#” key to indicate the end
of an input or wait 4 seconds.
•
On the web configuration page, if the “ Forward to PSTN ” is configured, the second stage dialing
format is eliminated, so after dialing into the FXO SIP account number, the PSTN number will be
called automatically
Grandstream Networks, Inc. HT488 User Manual Page 13 of 33
Firmware 1.0.3.64 Last Updated: 4/2007