zaptel.conf:

loadzone=fi
defaultzone=fi

span=1,1,3,ccs,ami
bchan=1-2
dchan=3

zapata.conf:

[channels]
musiconhold=default
language=fi
switchtype = euroisdn
signalling = bri_cpe
pridialplan=unknown
prilocaldialplan=unknown
echocancel=yes
immediate=no
overlapdial=yes
group = 1
context=from-isdn
channel => 1-2


extension.conf:
...
[from-isdn]
exten => s,1,Wait(1)
exten => s,2,SetCIDName(${CALLERID})
exten => s,3,Goto(inbound-menu,s,1)
exten => ***0,1,Wait(1)
exten => ***0,2,SetCIDName(${CALLERID})
exten => ***0,3,Goto(inbound-menu,s,1)
exten => ***1,1,Wait(1)
exten => ***1,2,SetCIDName(${CALLERID})
exten => ***1,3,Goto(inbound-menu,s,1)
...

log: BRI INTENSE DEBUG - on incoming call
----

< [ 02 ff 03 08 01 2a 05 04 03 80 90 a3 18 01 89 28 0b 30 30 34 30 35 31 34 38 35 37 35 6c 0c 01 83 30 34 30 35 31 34 38 35 37 35 70 05 80 34 37 38 30 7d 02 91 81 a1 ]
                                                                                
< Unnumbered frame:
< SAPI: 00  C/R: 1 EA: 0
<  TEI: 127        EA: 1
<   M3: 0   P/F: 0 M2: 0 11: 3  [ UI (unnumbered information) ]
< 51 bytes of data
-- Restarting T203 counter
                                                                                
< [ 02 01 01 01 ]
                                                                                
< Supervisory frame:
< SAPI: 00  C/R: 1 EA: 0
<  TEI: 000        EA: 1
< Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
< N(R): 000 P/F: 1
< 0 bytes of data
-- ACKing all packets from 0 to (but not including) 0
-- Since there was nothing left, stopping T200 counter
-- Stopping T203 counter since we got an ACK
-- Nothing left, starting T203 counter
-- Unsolicited RR with P/F bit, responding
Sending Receiver Ready (0)
                                                                                
> [ 02 01 01 01 ]
                                                                                
> Supervisory frame:
> SAPI: 00  C/R: 1 EA: 0
>  TEI: 000        EA: 1
> Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
> N(R): 000 P/F: 1
> 0 bytes of data
-- Restarting T203 counter
-- Restarting T203 counter
                                                                                
< [ 02 ff 03 08 01 2a 05 04 03 80 90 a3 18 01 89 28 0b 30 30 34 30 35 31 34 38 35 37 35 6c 0c 01 83 30 34 30 35 31 34 38 35 37 35 70 05 80 34 37 38 30 7d 02 91 81 a1 ]
                                                                                
< Unnumbered frame:
< SAPI: 00  C/R: 1 EA: 0
<  TEI: 127        EA: 1
<   M3: 0   P/F: 0 M2: 0 11: 3  [ UI (unnumbered information) ]
< 51 bytes of data
-- Restarting T203 counter
                                                                                
< [ 02 01 01 01 ]
                                                                                
< Supervisory frame:
< SAPI: 00  C/R: 1 EA: 0
<  TEI: 000        EA: 1
< Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
< N(R): 000 P/F: 1
< 0 bytes of data
-- ACKing all packets from 0 to (but not including) 0
-- Since there was nothing left, stopping T200 counter
-- Stopping T203 counter since we got an ACK
-- Nothing left, starting T203 counter
-- Unsolicited RR with P/F bit, responding
Sending Receiver Ready (0)
                                                                                
> [ 02 01 01 01 ]
                                                                                
> Supervisory frame:
> SAPI: 00  C/R: 1 EA: 0
>  TEI: 000        EA: 1
> Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
> N(R): 000 P/F: 1
> 0 bytes of data
-- Restarting T203 counter
-- Restarting T203 counter
                                                                                
............