iOS 环信视频语音 细节处理（挂断电话逻辑处理）

对方挂断语言，可能要发送相应的消息（对方拒接   挂断等）在结束实时通话的回调中
- (void)callDidEnd:(EMCallSession *)aSession
reason:(EMCallEndReason)aReason
error:(EMError *)aError 
根据EMCallEndReason这个枚举看通话结束的原因，去发送NSNotification通知
然后在聊天页面EaseMessageViewController.m中去监听这个通知，然后在通知方法中去插入消息，可参考以下代码：
NSString *insertStr = @"对方已挂断";
EMTextMessageBody *body = [[EMTextMessageBody alloc] initWithText:insertStr];
NSString *from = [[EMClient sharedClient] currentUsername];
//生成Message
EMMessage *message = [[EMMessage alloc] initWithConversationID:self.conversation.conversationId from:from to:self.conversation.conversationId body:body ext:nil];
message.chatType = EMChatTypeChat;// 设置为单聊消息
message.status = EMMessageStatusSucceed;
message.direction = callEnder;
[self addMessageToDataSource:message progress:nil];
[self.conversation insertMessage:message error:nil];