allow to change UA uri in runtime (#425)

* UA: allow to change 'uri' in runtime * expose UA.set in SIPUAHelper as setUAParam

Author: furmur

lib/src/sip_ua_helper.dart

@@ -404,6 +404,10 @@ class SIPUAHelper extends EventManager {
  return defaultOptions;
  }
 
+ bool setUAParam(String parameter, dynamic value) {
+ return _ua!.set(parameter, value);
+ }
+
  Message sendMessage(String target, String body,
  [Map<String, dynamic>? options, Map<String, dynamic>? params]) {
  return _ua!.sendMessage(target, body, options, params);

lib/src/ua.dart

@@ -435,6 +435,12 @@ class UA extends EventManager {
  break;
  }
 
+ case 'uri':
+ {
+ _configuration.uri = value;
+ break;
+ }
+
  default:
  logger.e('set() | cannot set "$parameter" parameter in runtime');