Pstn Pass Through - Grandstream Networks HT503 User Manual

dials C's number then # (or wait for 4 seconds).
2. A
3. If C answers the call, then
4. If C does not answer the call,
5. If A presses FLASH during the conference, C will be dropped out.
6. If A hangs up, the conference will be terminated for all three parties when configuration
"Transfer on Conference Hangup" is set to "No". If the configuration is set to "Yes",
transfer B to C so that B and C can continue the conversation.

PSTN PASS THROUGH

HT503 supports PSTN pass through using the FXS port. The user can place and receive PSTN calls
using analog phone connected to FXS port.

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 the web configuration) to switch to the PSTN line, listen for a dial tone, then dial the number.

If the 503 loses power or lost registration with SIP server, device will switch to mode when PSTN
line will be transparently connected directly to phone connected to FXS port. It will function as a
jack, enabling a direct connection to the PSTN Line.
FIRMWARE VERSION 1.0.9.1
A presses FLASH to bring B, C in the conference.
A can press FLASH back to talk to
HT503 USER MANUAL
B.
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A will