Our FreePBX works and is working, except for a recurring issue (or feature) with 2 S705 phones that will begin crackling in the audio after an unspecified period of time, usually 2+ days. The crackling audio makes the ability to listen on either the handset or speakerphone impossible.
The 2 affected S705’s are the only ones that also have the EXP100 sidecar attached (only 1 EXP100). All phones are being used in ethernet bridge mode to connect the users PC to the LAN. All LAN connections are 1Gbps, full duplex.
The affected desksets have the following physical connection:
The Ethernet LAN works for the PC just fine, either before the crackling or after. We have not identified a specific causing factor to the beginning of the crackling. A power cycle of the S705 will restore things to a clear audio and working condition again.
Additionally, the EXP100’s do not follow the backlight and dimming settings of the S705 phones. The EXP100 stays lit, even when the S705 screen goes dark. All extensions are setup and managed through Endpoint Manager.
We have done no monitoring of the FreePBX SIP or RTP traffic on this issue yet. Nor have we downloaded any logs from the phones. It is mpossible to understand audio when listening to a voicemail from the phone, when it is crackling. After phone reboot, you can listen to the same voicemail and it is clear audio.
There has been no support ticket opened yet. Starting here 1st. I am perfectly willing to go the support route. GO!!
Our environment is:
latest module versions as of 2/22/2020
from a SNG7 Distro install
On an VMWare ESXi 5.0 U2 virtual machine.
All phones are either on the local LAN, a few connect via our own gateway VPN’s. The affected phones are on the local LAN.
The affected S705 phones:
S705 firmware 18.104.22.168, with DSP 9.0.3
EXP100 firmware 22.214.171.124
This PBX has been working great through a testing phase. Now that we have deployed all Sangoma desksets, 15 total, a mix of S705 and S505’s, with 2 S705’s with EXP100, this issue has begun regularly.