Child pages
  • Troubleshooting Audio Issues DECT M700,M300,M85,M65,M25


Versions Compared

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

Table of Contents


Summary 

Troubleshooting choppy, garbled and out of sync audio issues in your DECT network can be a difficult task. Incorrect arrangement of the DECT base stations in a multicell is a known reason for many issues inclusing audio.

...

If you are experiencing audio issues you should check the RF/RSSI converage coverage in the areas where you are experiencing the problems. Make sure that the RSSI signal leven level between handset and nearest its current base is not below -75dB 75dBm.

Here is how to check the RSSI signal levels between the base stations and the handsets:

...

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. 


Fig. 1 


Fig. 2 


Fig. 3

Image Removed

Fig. 4 


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).

...

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.

Image Added

Fig. 4


RTP Collision Detection

You can also try enabling RTP Collision Detection on the base (the setting can be found in the web interface under Network). This settingcontrols 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. Per dafeuactdefault, this setting is off.


Survey Mode  

The Site survey mode can help to check handover/roaming scenarios and can give a more complete picture of the DECT conditions on-site (see https://helpdesk.snom.com/support/solutions/articles/6000167180-how-to-properly-deploy-a-dect-multicell-system -> Site Survey). Interference due to reflections should be easier to find with this function (error counter: FE). Also, an inconsistent multicell could be detected. 

...