Android client switching phone to Vibrate mode, phone does not Ring and calls are missed. 3CX v15.5

[Thiek]

Is anyone else experiencing this? Any suggestions on what to test, where to look, log files I can pull? Or better yet, how to fix it.

Looked at the detailer.log but nothing stands out as to what might cause it. Looked at setting up the “firebase cloud messaging” but I don’t think this will help because we get the call, the unit wakes up and we see the call coming through, but we don’t hear the ringtone. Restart the 3CX app to restore the ringtone but then after x number of calls the ringtone drops and back to only vibrating.

Phone model Zebra TC56CJ, Android - Nougat OS 7.1.2
3CX ver 15.5 (latest)
Phones does not have a SIM card, wireless connectivity only

 

[Thiek]

I have duplicated this issue multiple times and as of today it was duplicated by simply calling the 3cx soft-phone client repeated times and not answering the call, after 3 or 4 rings the caller hangs up or goes to voicemail, I would then exit the soft-phone and make additional calls where eventually it would stop ringing and vibrate only.

APP_VERSION: 1505651
PACKAGE_NAME: com.tcx.sipphone14
PHONE_MODEL: TC56
ANDROID_VERSION: 7.1.2
PHONE BRAND: Zebra
PHONE PRODUCT: TC56

 

[Thiek]

Last Thursday I discovered that if I call the device 15 times in a row it automatically switches to vibrate. Nothing is taking place such as locking device, using any other apps, messing with the volume, etc. I simply call the device and let it ring 2 or 3 times, hang up, call it again and let it ring 2 or 3 times, hang up... repeat 15 times and on the 15th time it goes to vibrate.

 

[LeonidasG_3CX]

Can you make sure that after doing this that you don't have stuck calls in your PBX? You can check this by going to your Management Console > Number of calls in use.

 

[Thiek]

I ran a test right now and watched the Active Calls screen. Like clockwork it went to vibrate mode although this time it was on call # 14. Each time I made a call it would display on the Active Call screen but then go away when I hung up; nothing was stuck.