[svn-commits] rmudgett: branch 1.4 r203908 - /branches/1.4/channels/chan_dahdi.c

[SVN commits to the Digium repositories]

Author: rmudgett
Date: Fri Jun 26 19:55:12 2009
New Revision: 203908

URL: http://svn.asterisk.org/svn-view/asterisk?view=rev&rev=203908
Log:
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

Modified:
    branches/1.4/channels/chan_dahdi.c

Modified: branches/1.4/channels/chan_dahdi.c
URL: http://svn.asterisk.org/svn-view/asterisk/branches/1.4/channels/chan_dahdi.c?view=diff&rev=203908&r1=203907&r2=203908
==============================================================================
--- branches/1.4/channels/chan_dahdi.c (original)
+++ branches/1.4/channels/chan_dahdi.c Fri Jun 26 19:55:12 2009
@@ -2463,15 +2463,12 @@
 			pri_set_crv(p->pri->pri, p->call, p->channel, 0);
 		}
 		p->digital = IS_DIGITAL(ast->transfercapability);
-		/* Add support for exclusive override */
-		if (p->priexclusive)
+
+		/* Should the picked channel be used exclusively? */
+		if (p->priexclusive || p->pri->nodetype == PRI_NETWORK) {
 			exclusive = 1;
-		else {
-		/* otherwise, traditional behavior */
-			if (p->pri->nodetype == PRI_NETWORK)
-				exclusive = 0;
-			else
-				exclusive = 1;
+		} else {
+			exclusive = 0;
 		}
 		
 		pri_sr_set_channel(sr, p->bearer ? PVT_TO_CHANNEL(p->bearer) : PVT_TO_CHANNEL(p), exclusive, 1);