Pstn-To-Voip Calls - Grandstream Networks HT503 FXO User Manual

PSTN-TO-VOIP CALLS

This function is available using the FXO port. The FXO port functions as a bridge between the Internet
and PSTN and enables calls to be passed from the PSTN network to VoIP. The user can make VoIP calls
remotely by dialing into the FXO line port on HT503.
To Make a PSTN-to-VoIP Call:
1. Make an incoming call to the PSTN line on FXO port. The phone will ring for 4 times by default
(this setting is configurable on the FXO port configuration page).
2. If no one answers the call after 4 rings (default configuration), then the caller hears either a
special continuous tone (prompting a PIN number) or a dial tone.
3. Enter a valid PIN (if configured under the BASIC configuration page). The caller will hear dial
tone and be bridged to VoIP. If an incorrect PIN is input, the continuous tone prompts caller to
enter a valid PIN. The caller may try 3 times to enter a valid PIN, if it is invalid the HT503 will
hang up.
4. The caller can dial a VoIP number followed by # (or wait for 4 seconds); the VoIP call will be
initiated from the SIP account configured on the FXO port.
N :
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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 HT503).
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When a PIN is configured for VOIP-to-PSTN call flow, the VoIP device that calls into the HT503
FXO account needs to configure RFC2833 or SIP Info for DTMF digit transmission.
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The special continuous tone is the prompt to enter a valid PIN code. If a caller doesn't enter a
valid PIN, the HT503 times out after 10 seconds. Users may press the "#" key to indicate the end
of an input or wait 4 seconds.
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On the web configuration page, if the "Forward to VoIP" 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
FIRMWARE VERSION 1.0.12.4
HT503 USER MANUAL
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