1 Signal Access Unit (SAU)

Connects with softswitch devices.

Interface description: 

Connects with SCP through TCP/IP. 

Connects with MSC and HLR through SS7.

2. Service Control Point (SCP)

Coordinating with USAU, SCP provides the service processing function. 

Interface description:

Connects with SAU through TCP/IP.

Connects with SMP through TCP/IP.

Connects with RBI through TCP/IP FTP and sends the bill to the Billing system.

Connects with GFEP through TCP/IP, providing the SMS, MMS, CDMA1X internet and banking services.

3. Service Management Point (SMP)

Interface description:

Connects with the SCP through TCP/IP. It connects with SCP through the default port 10001 to manage services of the SCP.

Connects with the Billing system through TCP/IP. It connects with the Billing system through the default port 29999 to provide the MML interface. According to the service development, the SMP also provides the FTP interface to transfer bills. 

Connects with the WEBSMAP through TCP/IP. It connects with WEBSMAP through the default port 29999 and FTP interface to provide the functions of managing and downloading user data in HTTP mode.

4. CBP

Interface description:

Connects with SCP through TCP/IP. It provides the rating and charging functions. 

5. WEBSMAP: Web page-based SMPMML interface

Interface description: 

Connects with SMP through TCP/IP. It connects with SMP through port 2999 to provide external query as a client in HTTP mode. 

6. I2000: Network Management System

Interface description: 

Connects with OAMServer through TCP/IP. It connects with upper layer network management system by port 4100, 9033, 161 and 162 through TCP/IP. It provides query function in HTTP mode through port 80. 

7. Record Bill Interface (RBI)

Interface description:

Connects with SCP through TCP/IP. It downloads the bills from directory SCP /tellinshare/sms/record to the local disk.

Connects with the Billing system through TCP/IP. It sends the bills in local disk to the Billing system by FTP.

8. GFEP

Interface description: 

Connects with SCP. The default port is 10003.

Connects with the banking system, BOSS and MDSP through TCP/IP. With the external interface protocol, GFEP enables the users to transfer the funds in the banking system, recharge to their accounts and so on. Currently, FEP connects with SMSC through SMPP+ to provide prepaid SM authentication function.

MFEP connects with MMSC/ISMG through EMPP to provide the prepaid MMS service and prepaid interconnecting SM service.

OIA connects with BOSS by the UASP protocol to provide universal recharge service.

GFEP will replace FEP, MFEP and OIA in the future.

Good but i think this is diagram of huawei support.
Thank