choppy, garbled and out of sync audio issues in your DECT network can
be a difficult task. The M85/M65 and M25 handsets have a diagnostic
menu that helps to determine if there is a weak or inadequate RF/RSSI signal
between the handset and the M700 or M300 Base unit.
Checking RSSI signal
If you are experiencing audio issues you
should check the RF/RSSI converage in the areas where you
are experiencing the problems. First check the
RSSI signal levels between the base stations and he handsets.
1. On the M65/M85, press the menu key
; on the M25, press the OK key . The main menu is shown on-screen.
2. Type *47* on the handset's keypad.
3. The handset will detect all base stations
within range and show their MAC addresses on the display (Fig. 1). If the
handset has detected more than one base, compare them with the MAC address on
the type label of your base station to identify and select the right one.
4. If necessary, scroll to the MAC address of
your base station. The selected item is highlighted in blue and expands to also
show the IP address of the base station (Fig. 2).
5. Press the function key underneath
"Select" (Fig. 2). The selected base station's RFPI and RSSI are
shown on the display (Fig. 3). ◦ RFPI: The Radio Fixed Part Identity is a
unique identifier frequently transmitted by the base station. ◦ RSSI: The Radio
Audio Loopback Testing
You can also do audio loopback testing to
see if the RF signal in those locations your have tested from is a contributing
factor of the audio issues.
6. Press the green key to establish an audio
loopback connection to the base station (Fig. 4). You can now speak into the
microphone of the handset to hear the echo of your voice.
You can also try enabling RTP Collision Control on the base
This setting controls whether the base checks for
RTP collision. RTP collision means that the device
is receiving RTP packages from more than one
source address with same SSRC.
Default Value: off
Try performing the RSSI and Loopback tests
on the affected handsets when the issue occurs and keep a log of the RSS levels
and loopback results for Snom Support if you open a ticket. If coverage and
RSSI is an issue, adding DECT repeaters to extend converge in your
Network may be necessary.
It is also recommended to have the latest
stable release of firmware upgraded to the base stations and the handsets.
It is also a good practice to gather the syslog and systems, calls, repeater,
and DECT statistics and settings files from the Base Stations for further
analysis If the RSSI levels and loopback testing proves inconclusive.