CompressBase compress = CompressBase.getInstance(this.getCompressType());
this.sdpType = SDPType.getSDPType(this.sdpEntity);
byte[] sdpData = serialize.serialize(this.sdpEntity);
sdpData = compress.zip(sdpData);
int protocolLen = HEAD_STACK_LENGTH + sdpData.length;
this.setTotalLen(protocolLen);
byte[] data = new byte[protocolLen];
data[0] = Protocol.VERSION;