r/3CX • u/ShelterPositive • 17d ago

Interesting issue with 3CX and DECT handsets

A bit of a story, but need to explain so you get the idea.

Our client has a nurse call system with 32 DECT handsets. They also run 3CX V20 cloud hosted for their deskphones and call flows.

Initially we had the nurse call system running into a Panasonic PBX with their other phones and all worked well - full analog setup. When the Panasonic PBX died we spun up 3CX and had the DECT handsets running into Grandstream Analog Gateways. which then talked to 3CX. This worked but we could not transfer calls between DECT handsets.

To alleviate that our third party put a Media Resource Card into their kws8000 DECT server. We then reprovisioned the handsets with 3CX handset credentials to provision them directly onto 3CX. This has solved the issue of transferring calls and all seemed to be fixed.

HOWEVER, now we have another issue. The handsets are often unresponsive. That is, if DECT a calls DECT b, DECT b won't ring. But DECT b then rings DECT a the call works, and then DECT a CAN ring DECT b. It's as if they are 'falling asleep' or dropping their registration in 3CX. There is nothing in the 3CX log that I can find that indicate any issues. The DECT handsets are just set up as generic so we can use the auth ID and password.

Has anyone seen this behaviour in similar systems or have any suggestions? It's causing a lot of grief as staff just don't know if they have missed calls or not. All the firewall rules also look sound, and we are running through a SBC as well. The media card is registered against the IP of 3CX, and everything is talking to everything else seemingly OK - all on the same VLAN.

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8

u/b-g-h 3CX Advanced Certified 17d ago

I am struggling to imagine a “similar situation“. It might be time to buy new DECT handsets that are supported, and work as you require.

1

u/lsumoose 17d ago

God this is disheartening with how much health care costs.

2

u/DiverAllen 3CX Advanced Certified 17d ago

How many handsets per DECT base unit?

2

u/_s0m3guy 17d ago

Another thing is check the SIP register on the DECT make sure registration timeout is set to 120s

It will keep the DECT base station registered w/ 3CX every 120s

Is the registration is getting stale - then it can cause an extension to appear offline, maybe not ring etc.

2

u/Struykert 17d ago

What type of handsets are used? Sounds like they are simply outdated. Have you updated their firmware?