We have a UC540 with 4 analogue lines connected in. The problem that we seem to get is when there are already 2 people on the phone, if anyone else rings in, they will get a busy tone rather than an auto attendant. I know this may be a problem due to UC not hanging up the line quick enough. This is my current config for one of the FXO ports.
trunk-group ALL_FXO 64
ring number 3
timing sup-disconnect 85
connection plar 398
description **ANALOGUE LINE**
caller-id alerting line-reversal
caller-id alerting dsp-pre-allocate
There are 4 separate lines which have the same number and it looks as if there is anther PBX in front as we have to press 9 to dial out if I connect an ordinary analogue phone straight to the line. We used to have an Asterisk system in place of the UC which worked fine.
The FXO that hangs - which should be solved if you set the proper disconnect tones for the FXO lines which most probably are not the same as the BT settings which you have set under the FXO ports. You should make PCM capture on the FXO port and find which is the disconnect tone.
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