CIMD Interface Specification - Elisa

2 Overview
Overview
A short message entity (SME), commonly referred to as an application, is
interconnected through the CIMD2 connection to a message centre (MC). The
CIMD2 protocol is currently supported by two different types of message centres:
the Short Message Service Center (SMS Center), and the Unstructured
Supplementary Service Data Center (USSD Center). The main purpose of this
interconnection is to transfer messages from the SMEs to the mobile stations
(MS) and from the MSs to the SMEs. Other kind of information can also be
conveyed over the interconnection, for example status reports from the GSM /
GPRS network to the SMEs.
The system architecture discussed in this document thus consists of the SME and
the MC, and the purpose of this document is to specify the interface between the
two.
When a message has been submitted to the SMS Center using the CIMD2, the
SMS Center uses its own retry policy to attempt to deliver the message. If the
delivery fails, the message is stored in the SMS Center database until a delivery
attempt succeeds. If a permanent error occurs, or the validity period of the
message expires, the message is deleted.
When a message has been submitted to the USSD Center using CIMD2, the
USSD Center immediately transfers the data to the mobile station (MS). If the
delivery fails, the message is deleted and the status of the message is made
available to the SME.
The computer interface is suitable for client applications that send and retrieve
messages. The interface supports TCP/IP sockets, X.25 PAD and serial ports
(modems). However, some message centres only support parts of the
connectivity.
The user always identifies himself in a "login". A login ID does not have to be
unique, but can be a commonly known name used in public services (like when
using premium charge modem lines).
The CIMD2 operations are specified in Chapters 3 CIMD operations and 5
Operation details. Each CIMD2 operation carries a number of parameters with it,
that is, data items specifying the subscriber, some facts about the operation itself,
and so on.
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