端点必须处于Established状态才能执行此操作

问题描述

我正在UCMA3.0 SDK中执行示例应用程序subscribepresence。  API remotePresenceView.StartSubscribingToPresentities抛出异常"端点必须处于Established状态才能执行此操作"。请告诉我
这个问题

I am executing sample application subscribepresence in UCMA3.0 SDK.  The API remotePresenceView.StartSubscribingToPresentities throws the exception "The endpoint must be in Established state to perform this operation". Please advice me on this problem

试试
{

     //订阅目标用户。

      _target = new RemotePresentitySubscriptionTarget（_remoteUserUri）;

       _remotePresenceView.StartSubscribingToPresentities（

         new RemotePresentitySubscriptionTarget [] {_target}）;

try
{
     // Subscribe to target user.
      _target = new RemotePresentitySubscriptionTarget(_remoteUserUri);
       _remotePresenceView.StartSubscribingToPresentities(
         new RemotePresentitySubscriptionTarget[] { _target });

是否我需要在Lync服务器中进行任何设置。

Whether I need to make any settings in Lync server.

提前致谢。

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