Q: Inbound calls intermittently get "Inbox is full" and dump to hangup. ? Known issue?

fortech

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Hi, I've got a client who is reporting a problem,
they tell me - some of their external caller/clients - ring their office number - and complain they get a message telling them "Inbox is full" and then the call hangs up
I cannot replicate this, all my test calls to the DID / office / 3cx > seem to work fine
it seems to be intermittent, ie, not a lot of calls get this, more like "has happened at least 3 times in the last 6 months" kind of thing. ie, kind of awful to debug.
I don't have any actual solid examples, they can't tell me a precise time-date-caller# for debug purposes.
I've asked them to try to gather such info if this happens again.
In the meantime I wanted to ask - if this sounds familiar to anyone, or if there is a known flow / situation / where this could possibly happen?

I'm also trying to chase if the SIP trunk carrier might be the source of the issue. But normally if the 3cx instance is offline/down/inaccessible -I am pretty sure the caller gets no actual voice message of any kind. So. A bit of a mystery.

In this case client is running on v.20.latest (ie, currently sitting on > Version 20.0 Update 3 (Build 806 Release) of 3cx. I've got about a ~dozen clients on this same hosting platform environment (OVH Montreal data centre) and none of my other clients have reported anything similar. ie, I am pretty confident my VM hosting is solid / server / network is solid etc.

thank you,

Tim
 
This doesnt seem to be a 3CX Prompt. Do you have an agent who is set to ring their mobile as well?

If their mailbox is full and the THEIR telco hangs up, the call is ended, because the PBX will see this as an answered call as far as the PBX is concerned.
 

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