chan_pjsip: set correct Endpoint Device State on multiple channels

1. When one channel is placed on hold, the device state is set to ONHOLD
without checking other channels states.
In case of AST_CONTROL_HOLD set the device state as AST_DEVICE_UNKNOWN
to calculate aggregate device state of all active channels.

2. The current implementation incorrectly classifies channels in use.
The only channels that has the states: UP, RING and BUSY are considered as "in use".
A channel should be considered "in use" if its state is anything other than
DOWN or RESERVED.

3. Currently, if the number of channels "in use" is greater than device_state_busy_at,
the system does not set the state to BUSY. Instead, it incorrectly assigns an aggregate
device state.
The endpoint device state should be BUSY if the number of channels "in use" is greater
than or equal to device_state_busy_at.

Fixes: #1181

channels/chan_pjsip.c

@@ -1221,15 +1221,14 @@ static int chan_pjsip_devicestate(const char *data)
 			ast_devstate_aggregate_add(&aggregate, ast_state_chan2dev(snapshot->state));
 		}
 
-		if ((snapshot->state == AST_STATE_UP) || (snapshot->state == AST_STATE_RING) ||
+		if (snapshot->state != AST_STATE_DOWN && snapshot->state != AST_STATE_RESERVED) {
-			(snapshot->state == AST_STATE_BUSY)) {
 			inuse++;
 		}
 
 		ao2_ref(snapshot, -1);
 	}
 
-	if (endpoint->devicestate_busy_at && (inuse == endpoint->devicestate_busy_at)) {
+	if (endpoint->devicestate_busy_at && (inuse >= endpoint->devicestate_busy_at)) {
 		state = AST_DEVICE_BUSY;
 	} else if (ast_devstate_aggregate_result(&aggregate) != AST_DEVICE_INVALID) {
 		state = ast_devstate_aggregate_result(&aggregate);
@@ -1791,7 +1790,7 @@ static int chan_pjsip_indicate(struct ast_channel *ast, int condition, const voi
 		device_buf_size = strlen(ast_channel_name(ast)) + 1;
 		device_buf = alloca(device_buf_size);
 		ast_channel_get_device_name(ast, device_buf, device_buf_size);
-		ast_devstate_changed_literal(AST_DEVICE_ONHOLD, 1, device_buf);
+		ast_devstate_changed_literal(AST_DEVICE_UNKNOWN, AST_DEVSTATE_CACHABLE, device_buf);
 		if (!channel->session->moh_passthrough) {
 			ast_moh_start(ast, data, NULL);
 		} else {
@@ -1807,7 +1806,7 @@ static int chan_pjsip_indicate(struct ast_channel *ast, int condition, const voi
 		device_buf_size = strlen(ast_channel_name(ast)) + 1;
 		device_buf = alloca(device_buf_size);
 		ast_channel_get_device_name(ast, device_buf, device_buf_size);
-		ast_devstate_changed_literal(AST_DEVICE_UNKNOWN, 1, device_buf);
+		ast_devstate_changed_literal(AST_DEVICE_UNKNOWN, AST_DEVSTATE_CACHABLE, device_buf);
 		if (!channel->session->moh_passthrough) {
 			ast_moh_stop(ast);
 		} else {

res/res_pjsip/pjsip_config.xml

@@ -1084,8 +1084,8 @@
 					</since>
 					<synopsis>The number of in-use channels which will cause busy to be returned as device state</synopsis>
 					<description><para>
-						When the number of in-use channels for the endpoint matches the devicestate_busy_at setting the
+						When the number of in-use channels for the endpoint equal to or greater than the devicestate_busy_at setting
-						PJSIP channel driver will return busy as the device state instead of in use.
+						the PJSIP channel driver will return busy as the device state instead of in use.
 					</para></description>
 				</configOption>
 				<configOption name="t38_udptl" default="no">