| The OSI model | |
|---|---|
| 7 | Application layer |
| 6 | Presentation layer |
| 5 | Session layer |
| 4 | Transport layer |
| 3 | Network layer |
| 2 | Data link layer |
| 1 | Physical layer |
Server Routing Protocol (SRP) is the proprietary network protocol used to transfer data between a BlackBerry Enterprise Server and the Research In Motion BlackBerry infrastructure.
SRP communication takes place on TCP port 3101 by default.