res_pjsip_dialog_info: Add missing "direction" attribute in NOTIFY event

BLF pickup isn't working on Cisco SPA and Snom phones
if the direction="recipient" attribute is missing in 'dialog' tag.

This patch adds direction="recipient" if extension state is
Ringing.

ASTERISK-24601 #close

Change-Id: I5b2c097ca29fd59e92ba237ca5d397cb1b0bcd8c

res/res_pjsip_dialog_info_body_generator.c

@@ -133,6 +133,9 @@ static int dialog_info_generate_body_content(void *body, void *data)
 
 	dialog = ast_sip_presence_xml_create_node(state_data->pool, dialog_info, "dialog");
 	ast_sip_presence_xml_create_attr(state_data->pool, dialog, "id", state_data->exten);
+	if (state_data->exten_state == AST_EXTENSION_RINGING) {
+		ast_sip_presence_xml_create_attr(state_data->pool, dialog, "direction", "recipient");
+	}
 
 	state = ast_sip_presence_xml_create_node(state_data->pool, dialog, "state");
 	pj_strdup2(state_data->pool, &state->content, statestring);