Huawei ADD is a product which can obtain triple elements from mobile core network， and triple elements include IMEI、MSISDN and IMSI． After obtaining the triple elements, ADD will invoke the interface
provided by OTA and send the configuration short message to the cell phone afterwards. General speaking, ADD product obtains triple elements through the SS7 sigtran way of triggering from MSC, by using this way, the connection between ADD and Core network
is SS7 sigtrans protocol. Once the cell phone power off and then power on, ADD can obtain the triple elements including IMEI，MSISDN and IMSI. But for theMegafone ADD
project， Requirements are different from the normal ADD product. It is very obvious for us to know the difference by the below chart.
By this chart, there will be 3 ways for ADD to obtain the triple elements. Apart form the normal SS7 sigtrans way, ADD product still has 2 other ways to obtain the triple elements, one is to obtain
the triple elements by UDP protocols，the other is to obtain the triple elements by SMPP protocols.
1: For Huawei MSC， we adopt SS7 sigtran protocol to obtain the triple elements. Being the basic functions of
ADD，the parts of the functions have been used widely in lots of projects. We can test these functions inMegafone without customizing．
2: For Nokia and Siemens MSC， in accord to the requirement fromMegafone, ADD product
will has to connect to the VLR and SMC by the protocols of UDP and SMPP to obtain the triple elements．These 2 features should been customized. After our R&D reading the documents of protocols, they draw a conclusion
that the features are not complicated, the features can be realized，the key problems are that R&D need time to meet the requirements.
3: Another key point is that ADD product has to connect to MME to identify whether a IMEI is in black list or white list or not by diameter protocol.
In the previous projects, ADD product realize this function by connecting to the real EIR device to realize the identification , but for
Megafone ADD requirement, it is also different from the previous project，we still need time to realize this feature， but please do not worry about this problem, we have confidence to finish this
feature. Everything we need is just the time. We will concentrate our maximum resources on this project.