Grandstream Networks HandyTone HT286 Product Related Questions page 25

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Contact Grandstream Support for the latest firmware or visit www.grandstream.com.
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Set the following values in the FXO Lines web configuration page:
o Enable Current Disconnect to Yes (if the PSTN provider utilizes Current
Disconnect).
o Current Disconnect Threshold: 300
o Min Delay Before Dial PSTN: 750
Q: What should I do if I encounter port hang after a few calls?
Generally, port hang is caused by inability to detect the disconnect signal from the side that
hangs up first; usually it is when the PSTN side hangs up first. Follow these steps to fix this
problem:
Call your PSTN carrier and ask what kind of PSTN disconnect signal is used − power
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disconnect (or current disconnect) or tone disconnect.
o
If it is power disconnect (common in most developed countries), ask for the
duration of power loss as a disconnect signal.
o
If tone disconnect is used, ask for the disconnect tone frequency and cadence, as
well as AC Termination impedance.
o
Re-configure the GXW410x to reflect the disconnect signal used by the PSTN
carrier.
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o Reboot the GXW and place some test calls. If the port hang issue is not fixed,
contact Grandstream Technical Support.
Q: What is the difference between an FXO and an FXS Gateway?
FXO Gateway (GXW410x) - Its allows IP networks to talk to PSTN networks through the
gateway by simply connecting analog lines to it. Primarily used to allow remote IP endpoints to
be able to use local main office PSTN lines.
FXS Gateway (GXW400x) - It allows your traditional telephone system to function as an IP
System by simply connecting analog FXS trunks or analog handsets to the gateway. Primarily
used to allow traditional handsets/PABX to be used in an IP environment.
Power Disconnect: navigate to FXO Lines in the web configuration
pages and set Enable Current Disconnect to "Yes". Make sure the correct
duration of power loss is set in Current Disconnect Threshold. Set Enable
Tone Disconnect to "No".
Tone Disconnect: navigate to FXO Lines in the web configuration pages
and set Enable Current Disconnect to "No". Re-configure the AC
Termination Impedance and the disconnect tone frequency and cadence
(usually Reorder Tone or Busy Tone under Channels in the web
configuration pages) to match your PSTN provider.