Set the CALLERID(dnid-num-plan) for incoming ISDN calls.

The CALLEDTON channel variable is set for incoming ISDN calls to the lower
7 bits of the Q.931 type-of-number/numbering-plan octet.  The
CALLERID(dnid-num-plan) should have the same value.

(closes issue ASTERISK-21248)
Reported by: rmudgett
........

Merged revisions 383796 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@383798 65c4cc65-6c06-0410-ace0-fbb531ad65f3