asterisk users - Nov 2012 - why number type always changed from subscriber user to national in libpri

hello:I used libpri 1.4.12 version with asterisk 1.8.7, after the pcap files, i
found thatin wireshark setup message, the number type always changed from
subscriber to national number.i have set pridialplan= local and
prilocaldialplan=local in chan_dahdi.conf already. because that, the
systemsometimes can not make outgoing calls.  anyone can clarify that?
Best regards,
James.zhu
Doing asterisk/PRI/ss7/dahdi, linux, asterisk/sangoma cards, recording device,
VOIP gateway.
website: www.hiastar.com 
 		 	   		  
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> I used libpri 1.4.12 version with asterisk 1.8.7, after the pcap
> files, i found that
> in wireshark setup message, the number type always changed from
> subscriber to national number.
> i have set pridialplan= local and prilocaldialplan=local in
> chan_dahdi.conf already. because that, the system
> sometimes can not make outgoing calls. anyone can clarify that?
Use of Asterisk v1.8.7 with libpri is *not* recommended.  That
version of Asterisk has a regression in its ./configure script
that does not setup Asterisk to use libpri correctly.  Also,
Asterisk v1.8.7 is quite old now.

Richard