TDA200 Calls being cut off 1

[meanmofo]

Got a ticket today, customer reports that when a call is transferred from reception to another extension the recieving extension sometimes hears a beeping (like a call waiting tone) and then is cut off from their current conversation but there is no second call waiting.

The extension that calls are transferred to is in the ICD group to ring after 6 rings but the receptionist generally answers and transfers.

I tried to replicate this to no avail.

Overflow is set to go to external number (day) or VM (night)

I'm a bit stumped

 

[obtsystems]

It could be something set in cos. Extension to co timer enabled?

 

[meanmofo]

I had a look at that but it's disabled. In fact, most of the COS settings are default

Ext-CO limitation is also disabled in 2-9

 

[meanmofo]

Followup

Haha- Calls into this PBX are being routed from another (Ericsson) PBX 2000kms away and that's what is cutting the calls off, lol