code: public static Bridge create(final BandwidthClient client, final String callId1, final String callId2)
      	    throws Exception 
      {
      	assert (callId1 != null);
  
      	final HashMap<String, Object> params = new HashMap<String, Object>();
  
      	params.put("bridgeAudio", "true");
  
          String[] callIds = null;
  
          if (callId1 != null && callId2 != null) {
              callIds = new String[] { callId1, callId2 };
          } else if (callId1 != null && callId2 == null) {
              callIds = new String[] { callId1 };
          } else if (callId1 == null && callId2 != null) {
              callIds = new String[] { callId2 };
          }
  
      	params.put("callIds", callIds == null ? Collections.emptyList()
      		: Arrays.asList(callIds));
  
      	return create(client, params);
  	}
docs: Convenience method to create a Bridge object from two call ids
  @param client the client
  @param callId1 the call id
  @param callId2 the call id
  @return the Bridge
  @throws IOException unexpected error.