only require user and pass in gateway when register is true

src/mod/endpoints/mod_sofia/sofia.c

@@ -2416,6 +2416,7 @@ static void parse_gateways(sofia_profile_t *profile, switch_xml_t gateways_tag)
 				}
 			}
 
+			if (switch_true(register_str)) {
 				if (zstr(username)) {
 					switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "ERROR: username param is REQUIRED!\n");
 					goto skip;
@@ -2425,6 +2426,7 @@ static void parse_gateways(sofia_profile_t *profile, switch_xml_t gateways_tag)
 					switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "ERROR: password param is REQUIRED!\n");
 					goto skip;
 				}
+			}
 
 			if (zstr(from_user)) {
 				from_user = username;