These issues cause dropped packets, which are indicated on the Dejitter queue
graph on the openSPOT4's Status page as "invalid seqnum errors". They may
cause dropouts in the voice transmissions.
If there are no invalid seqnum errors, but the dejitter queue graph shows that
the queue gets empty during a call, then you can try increasing the dejitter
queue length at the Network settings section.
Make sure you use a server nearest to your location to avoid network dropouts
and high latency. Please keep in mind, that packet loss and high latency can
occur in VoIP (Voice over IP) streams even if you have a really high quality
network connection.
What you can do to avoid dropouts are:
Use a different server, which has a stable connection (try BrandMeister
servers in cross mode)
Place the openSPOT4 close to the Wi-Fi router.
Make sure the Wi-Fi bandwith is set to max. 20Mhz in the Wi-Fi router
(see explanation here)
Try switching Wi-Fi channel on your Wi-Fi router. The currently used one
may be overcrowded, which you may not notice during web browsing, as
the web uses a protocol which resend missing data frames, but this can't be
done in real time VoIP streams so the packet loss issue becomes instantly
noticable. Only channels 1, 6 or 11 should be used (see explanation here)
Try using a different Wi-Fi router or internet connection
Wi-Fi disconnects (blue status LED) or internet
connection errors (red/blue status LED)
Try to set another Wi-Fi channel in your Wi-Fi network. The currently used one
may be overcrowded. It is advisable to use Wi-Fi channels 1, 6 or 11. Do not use
the others as they only cause more interference. Also try placing the
openSPOT4 closer to your Wi-Fi router / access point.
Color code mismatch warnings on the web interface
Make sure the color code programmed for your radio's current channel is
matching the openSPOT4's color code. If they match, then probably there's an
offset between the radio's TX frequency and the openSPOT4's RX frequency.
Please use DMR AutoCal, or manually enter different frequencies in +-100 Hz
steps at the RX offset on the Modem page for the lowest BER. You can test
your voice using the openSPOT4's built-in local echo service by calling DMR ID
9999.
The device can't check firmware upgrades, it shows
retrying
Make sure the NTP, HTTP and HTTPS outgoing traffic are not disabled in your
router's firewall. You can also try turning the Use DHCP server if available
option off.
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