Merged revisions 203908 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r203908 | rmudgett | 2009-06-26 19:55:12 -0500 (Fri, 26 Jun 2009) | 16 lines
  
  The ISDN CPE side should not exclusively pick B channels normally.
  
  Before this patch, Asterisk unconditionally picked B channels exclusively
  on the CPE side and normally allowed alternative B channels on the network
  side.  Now Asterisk does the opposite.
  
  Reasons for the CPE side to normally not pick B channels exclusively:
  *  For CPE point-to-multipoint mode (i.e. phone side), the CPE side does
  not have enough information to exclusively pick B channels.  (There may be
  other devices on the line.)
  *  Q.931 gives preference to the network side picking B channels.
  *  Some telcos require the CPE side to not pick B channels exclusively.
  
  (closes issue #14383)
  Reported by: mbrancaleoni
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@203909 65c4cc65-6c06-0410-ace0-fbb531ad65f3