app_callerid: Allow time zone to be specified.

Now that ast_callerid_callwaiting_full_tz_generate is available (via patch),
we can specify time zones for the Caller ID spill, so add an argument
that allows overriding the system time zone. This finally allows for
essentially full feature parity with FOB: https://github.com/InterLinked1/orange-box

This argument is being added before options, so this syntax is
not backwards-compatible with existing usage.

Author: InterLinked1

apps/app_callerid.c

@@ -73,6 +73,10 @@
 				<para>Redirecting reason, e.g. REDIRECTING(reason).</para>
 				<para>Default is none (not sent).</para>
 			</parameter>
+			<parameter name="timezone">
+				<para>TZ-format timezone to use for date/time.</para>
+				<para>Default is the system time zone.</para>
+			</parameter>
 			<parameter name="options">
 				<optionlist>
 					<option name="c">
@@ -230,6 +234,7 @@ static int cwcid_exec(struct ast_channel *chan, const char *data)
 	char *clidnum, *clidname;
 	int presentation = -1, redirecting = -1, qualifier = 0;
 	int dahdi = 0; /* whether to try to use native DAHDI */
+	const char *tz;
 #ifdef HAVE_DAHDI
 	struct dahdi_pvt *pvt = NULL;
 #endif
@@ -239,6 +244,7 @@ static int cwcid_exec(struct ast_channel *chan, const char *data)
 		AST_APP_ARG(name);
 		AST_APP_ARG(presentation);
 		AST_APP_ARG(redirecting);
+		AST_APP_ARG(timezone);
 		AST_APP_ARG(options);
 	);
 
@@ -264,6 +270,7 @@ static int cwcid_exec(struct ast_channel *chan, const char *data)
 		}
 	}
 
+	tz = args.timezone;
 	clidnum = ast_strlen_zero(args.number) ? ast_channel_caller(chan)->id.number.str : args.number;
 	if (strlen(clidnum) > 15) {
 		ast_log(LOG_WARNING, "Caller ID number '%s' is greater than 15 characters and will be truncated\n", clidnum);
@@ -424,14 +431,15 @@ static int cwcid_exec(struct ast_channel *chan, const char *data)
 		/* similar to my_send_callerid in chan_dahdi.c: */
 		pvt->callwaitcas = 0;
 		pvt->cidcwexpire = 0;
-		pvt->cidlen = ast_callerid_callwaiting_full_generate(pvt->cidspill,
+		pvt->cidlen = ast_callerid_callwaiting_full_tz_generate(pvt->cidspill,
 			cnam,
 			clid,
 			NULL,
 			redirecting,
 			presentation,
 			qualifier,
-			AST_LAW(pvt));
+			AST_LAW(pvt),
+			tz);
 		pvt->cidlen += READ_SIZE * 4;
 		pvt->cidpos = 0;
 		pvt->cid_suppress_expire = 0;
@@ -457,15 +465,15 @@ static int cwcid_exec(struct ast_channel *chan, const char *data)
 			ast_log(LOG_WARNING, "Failed to malloc cidspill\n");
 			return -1;
 		}
-		cidlen = ast_callerid_callwaiting_full_generate(cidspill,
+		cidlen = ast_callerid_callwaiting_full_tz_generate(cidspill,
 			cnam,
 			clid,
 			NULL,
 			redirecting,
 			presentation,
 			qualifier,
-			ast_format_ulaw);
-
+			ast_format_ulaw,
+			tz);
 		if (cwcid_careful_send(chan, cidspill, cidlen, NULL)) {
 			ast_log(LOG_WARNING, "Failed to write cidspill\n");
 			res = -1;