asterisk users - Dec 2006 - Asterisk as bridge, strange ${EXTEN} values

Hello,

I have this setup:
Telco --PRI(g1,ext-incoming)--> Asterisk TE405P
--PRI(g2,int-incoming)--> Alcatel OXO

extensions.conf:

[ext-incoming]
exten => _X.,1,Noop
exten =>
_X.,n,SetVar(CALLFILENAME=${TIMESTAMP:0:4}/${TIMESTAMP:4:2}/${TIMESTAMP:6:2}/${TIMESTAMP}-${UNIQUEID}-${EXTEN})
exten => _X.,n,Monitor(wav,${CALLFILENAME},b)
exten => _X.,n,Dial(Zap/g2/${EXTEN})
exten => h,1,Noop
exten => h,n,Noop(Process ${CALLFILENAME})

[int-incoming]
exten => _X.,1,Noop
exten =>
_X.,n,SetVar(CALLFILENAME=${TIMESTAMP:0:4}/${TIMESTAMP:4:2}/${TIMESTAMP:6:2}/${TIMESTAMP}-${UNIQUEID}-${EXTEN})
exten => _X.,n,Monitor(wav,${CALLFILENAME},b)
exten => _X.,n,Dial(Zap/g1/${EXTEN})
exten => h,1,Noop
exten => h,n,Noop(Process ${CALLFILENAME})

The problem that I have wav file and cdr(dst) records with "wrong"
phone number but real conversation. I mean wrong phone numbers but
works like good because there is conversation. So Dial is work because
of conversation but dst field and filename is "wrong". How is it
happen? If Dial is good then SetVar must be good as well. Isn't it?

My system is FC5 with latest stable versions (zaptel 1.2.11, libpri
1.2.4, asterisk 1.2.13).

Any idea where should be the problem?

bye,
Zsolt