Don't pass zero length callerid to ooh323 stack

Don't pass zero callerid string to ooh323 stack because it can't encode this properly and
can't generate setup message.

(closes issue #17186)
Reported by: vmikhelson
Patches:
      zero_callerid_num.patch uploaded by may213 (license 454)
Tested by: may213



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@258838 65c4cc65-6c06-0410-ace0-fbb531ad65f3

addons/chan_ooh323.c

@@ -1907,7 +1907,7 @@ int onNewCallCreated(ooCallData *call)
 				ast_verbose("Setting dialed digits %s\n", p->caller_dialedDigits);
 			}
 			ooCallAddAliasDialedDigits(call, p->caller_dialedDigits);
-		} else if (p->callerid_num) {
+		} else if (!ast_strlen_zero(p->callerid_num)) {
 			if (ooIsDailedDigit(p->callerid_num)) {
 				if (gH323Debug) {
 					ast_verbose("setting callid number %s\n", p->callerid_num);