Setup & Configuration
HDE-VoIP Telephones
Page 37
9. On an Asterisk-based VoIP SIP PBX system, the Guardian SIP Device status is "Busy" or
"Unreachable". I have set up both the Guardian VoIP SIP device and the PBX extension information for
the device. I can see the device on the network, am able to PING it, and can bring up the device web
page with a browser. However, when I try to call it from a phone extension, I see the word "Busy" or
"Unreachable" in the Asterisk log.
In the PBX setup page for the extension of the Guardian device, find the
Qualify=
value and change it to
NO
.
If the
Qualify=
value requires a numeric value, then change it to
0
.
Note that on some Asterisk systems (such as
Intuitive Voice
) this value is called the
Heartbeat=
value. Set
the
Heartbeat=
value to
NO
, and then save the settings.
Also, on the product's
SIP Setup
page, make sure that the
Register Expiration (minutes)
setting is set to
less than
6
minutes (
5
minutes is good) because it needs to be a value less than the Asterisk default value of
6 minutes. Save the settings after changing the
Register Expiration (minutes)
setting.
10. What type of audio files can be uploaded into the device?
RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 8000 Hz
You can use the free utility 'Audacity' (
http://audacity.sourceforge.net/
) to convert audio files into a format the
device can recognize.
When you export an audio file with this program, you can save the output as "WAV (Microsoft) signed 16 bit
PCM."
11. On the V2 products, what happens during a firmware upload if the process gets corrupted?
To guard against failed firmware upgrades, units shipped from Guardian Telecom with V.0.0.29 feature a
built-in "fail safe" mechanism.
The Device will store the "TFTP Server IP" and "New Filename" entered on the "Update Firmware" web page.
If, during the boot process, the Device is unable to boot the firmware, it will attempt to download the stored
image from the stored TFTP server.
12. I see in the electrical connection diagram in the user’s guide that there is a High PIV Ultra Fast
switching diode. Do I need it and if so do you have a source?
This High PIV Ultra Fast switching diode prevents CEMF kick back from an intermediary relay coil when
power is cut and the coil field collapses. You could use an On-Semi MUR105 diode or an IN4007, which is
readily available.
Specifications Datasheet
Digi-Key Part Ordering
13. We have the Cisco 3550 switch and it looks like the unit is not able to negotiate the power with the
switch. It keeps cycling over and over.
This happens because with default settings, the switch port is resetting power too quickly. Therefore, on the
3550 switch, on the switch port that the unit is attached to, please try adding the following CLI command:
power inline delay shutdown 20 initial 300
That should keep power supplied until the unit can boot up all the way.
14. The Guardian device connected to a Dell Powerconnect 3524P or 3548P port did not stay linked up.
The device comes up, and then it goes down, and then it comes up cycling.
If connected to a Linksys SRW208MP switch, the Guardian device stays up.
