No subject

1. If the other end picks up the phone the conversation is successful and when
the conversation ends, the channel is properly released:

    -- CAPI/ISDN1#02/2104988888-0 answered SIP/1000-081d91b0
  == ISDN1#02: CAPI Hangingup for PLCI=0x101 in state 2
  == Spawn extension (internal, 2104988888, 1) exited non-zero on
'SIP/1000-081d91b0'
       > ISDN1#02: CAPI INFO 0x3490: Normal call clearing

2. BUT: If I hangup the softphone before someone answers, I get:

  == ISDN1#02: CAPI Hangingup for PLCI=0x101 in state 5

and the 1st channel is left occupied:

atlas*CLI> capi show channels
CAPI B-channel information:
Line-Name       NTmode state i/o bproto isdnstate   ton  number
----------------------------------------------------------------
ISDN1#02         no    discP  O  trans  *P          0x00 '1000'->'2104988888'
ISDN1#01         no    -----  -  trans              0x00 ''->''

If I call again and hangup before someone answers, the 2nd channel is used and
then left occupied:

atlas*CLI> capi show channels
CAPI B-channel information:
Line-Name       NTmode state i/o bproto isdnstate   ton  number
----------------------------------------------------------------
ISDN1#02         no    discP  O  trans  *P          0x00 '1000'->'2104988888'
ISDN1#01         no    discP  O  trans  *           0x00 '1000'->'2104988888'