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The ISDN CPE side should not exclusively pick B channels normally.

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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


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@203908 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett
2009-06-27 00:55:12 +00:00
parent fc73897bbd
commit f65dccafb6
1 changed files with 5 additions and 8 deletions
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13
channels/chan_dahdi.c
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@@ -2463,15 +2463,12 @@ static int dahdi_call(struct ast_channel *ast, char *rdest, int timeout)
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);