What is SS7 over IP, ‘SIGTRAN’

SS7 protocol SS7 is a protocol responsible to move the signaling messages between telecom network nodes. It is using the Service Switching Points (SSPs), and Signal Transfer Points (STPs). The SSPs are the end points that need to transfer messages…

PDP Context Deactivation Procedure

The MS, the SGSN, and the GGSN can initiate The ‘PDP context deactivation procedure’. PDP Context Deactivation Procedure (MS initiated) The MS sends ‘Deactivate PDP context request’ to the SGSN, including the TI of the PDP. There is an information…

NSAPI and TI – PDP identifiers

NSAPI NSAPI refers to ‘Network layer Service Access Point Identifier’. The MS generates the NSAPI in the ‘PDP context activation’ procedure, And the MS sends it in the ‘Active PDP context request’ sent to the SGSN. After the ‘PDP context activation’…

PDP type in GPRS

PDP type is the type of the IP address assigned to the PDP. PDP type maybe one of the following, IPv4. IPv6. IPv4v6 (Dual stack). The PDP type exists in subscription information that exists in the HLR for every MS. The…