--- asterisk-18.12.1/res/res_pjsip/pjsip_configuration.c	2022-05-19 08:51:28.000000000 -0700
+++ asterisk-18.12.1-fixed/res/res_pjsip/pjsip_configuration.c	2022-06-06 23:26:16.579209220 -0700
@@ -220,7 +220,7 @@
 	} else if (!strcasecmp(var->value, "required")) {
 		endpoint->extensions.flags |= PJSIP_INV_REQUIRE_TIMER;
 	} else if (!strcasecmp(var->value, "always") || !strcasecmp(var->value, "forced")) {
-		endpoint->extensions.flags |= PJSIP_INV_ALWAYS_USE_TIMER;
+		endpoint->extensions.flags |= (PJSIP_INV_SUPPORT_TIMER | PJSIP_INV_ALWAYS_USE_TIMER);
 	} else if (!ast_false(var->value)) {
 		return -1;
 	}