[HELP] How to clear E1 (R2-Digital) channel -- clearfwd

[yso8629]

Hi,

the new Cisco IPT was implemented in Brazil about a month ago and I'm having trouble with PSTN (R2-Digital).
The symptom is:
When a call receives from Voice-GW and ends then it doesn't release the occupied channel.
It stays in "clearfwd" status and does not go to "idle" status.

I had to manually reset the E1 controller to clear (but this will cause live calls to disconnect...)

Does anyone have any idea what the cause may be?
Also, how do I release the channel manually instead resetting the circuit?

Here's what I see from the "sh voice port sum"

0/1/0:0 01 r2-digital up dorm idle idle y
0/1/0:0 02 r2-digital up dorm idle idle y
0/1/0:0 03 r2-digital up dorm idle idle y
0/1/0:0 04 r2-digital up dorm idle idle y
0/1/0:0 05 r2-digital up up answered idle y
0/1/0:0 06 r2-digital up up answered idle y
0/1/0:0 07 r2-digital up dorm idle idle y
0/1/0:0 08 r2-digital up up answered idle y
0/1/0:0 09 r2-digital up up answered idle y
0/1/0:0 10 r2-digital up up clearfwd idle y
0/1/0:0 11 r2-digital up dorm idle idle y
0/1/0:0 12 r2-digital up dorm idle idle y
0/1/0:0 13 r2-digital up dorm idle idle y
0/1/0:0 14 r2-digital up up clearfwd idle y
0/1/0:0 15 r2-digital up dorm idle idle y
0/1/0:0 17 r2-digital up dorm idle idle y
0/1/0:0 18 r2-digital up dorm idle idle y
0/1/0:0 19 r2-digital up up answered idle y
0/1/0:0 20 r2-digital up dorm idle idle y
0/1/0:0 21 r2-digital up dorm idle idle y
0/1/0:0 22 r2-digital up dorm idle idle y
0/1/0:0 23 r2-digital up dorm idle idle y
0/1/0:0 24 r2-digital up dorm idle idle y
0/1/0:0 25 r2-digital up dorm idle idle y
0/1/0:0 26 r2-digital up dorm idle idle y
0/1/0:0 27 r2-digital up up answered idle y
0/1/0:0 28 r2-digital up up idle answered y
0/1/0:0 29 r2-digital up up clearfwd idle y
0/1/0:0 30 r2-digital up dorm idle idle y
0/1/0:0 31 r2-digital up up idle answered y

Appreciate if anyone can help.
Thanks.