Merged revisions 203909 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

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  r203909 | rmudgett | 2009-06-26 20:07:52 -0500 (Fri, 26 Jun 2009) | 23 lines
  
  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: http://svn.digium.com/svn/asterisk/branches/1.6.2@203941 f38db490-d61c-443f-a65b-d21fe96a405b

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