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Short Message Service (SMS)
The SMS feature provides means for SMS messages handling and the reporting of SMS reception
events. The SMC modem SMS implementation is based on the 3GPP 23.040 specification.
The SMS, as defined within the GSM 800/1900 digital mobile phone standard:
A single short message can be up to 160 characters of ASCII text in length (7-bit coded).
Message text can comprise words, numbers or an alphanumeric combination.
Short messages can be written and displayed in various coding schemes, including ASCII and
UCS2.
Reception of an incoming message can invoke an indication to the terminal. This feature is
configurable using the command AT+CNMI.
Cell broadcast messages can also be selected and received on the SMC modem. The SMc
modem enables registration to specific broadcast channels.
A CDMA SMS message belongs to one of three message definitions:
Point-to-point messages are for sending messages between phones. Such messages include
addressing information and a structured data area, which can include fields that describe
various message properties, as well as the user data (i.e. the message contents to display to
the user).
Acknowledge messages exist to pass status information. They simply contain a cause (error)
code.
Broadcast messages are sent from the network to all phones in a certain geographical area.
They cannot be sent from a phone.
A point-to-point message can have a teleservice identifier to specify the application that should
handle it. The standard defines the operation of six teleservices.
The Wireless Messaging Teleservice (WMT) is for short text messaging between users. The Wireless
Enhanced Messaging Teleservice (WEMT) extends this to include EMS elements such as pictures.
Outgoing messages of these two teleservices can be created. Incoming messages of these
teleservices are stored in the message store.
Other teleservices defined are: IS-91 Extended Protocol Enhanced Services, Wireless Paging
Teleservice (WPT), Voice Mail Notification (VMN), and Service Category Programming Teleservice
(SCPT). Incoming WPT and VMN messages are stored in the message store.
A new incoming message is saved in the first free memory location, from index 251. The SMC
modem cell module memory can contain up to 250 outgoing and broadcast (CB) messages. A new
outgoing message is saved in the next free memory location, from index 1 up to index 200.
Incoming Message index: 251, 252, . . . 350 (max #)
Outgoing Message index:
1, 2, . . . 200 (max #)
CB Message index:
201, 202, . . . 250 (max #)
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