Merged revisions 38234 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.2

........
r38234 | file | 2006-07-26 11:26:06 -0400 (Wed, 26 Jul 2006) | 2 lines

Put default callerid into contact when the one specified is either NULL or has a zero string length. (issue #7590 reported by key2)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@38235 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -6286,7 +6286,7 @@ static void initreqprep(struct sip_request *req, struct sip_pvt *p, int sipmetho
 		l = CALLERID_UNKNOWN;
 		n = l;
 	}
-	if (!l)
+	if (ast_strlen_zero(l))
 		l = default_callerid;
 	if (ast_strlen_zero(n))
 		n = l;