* SMS (Short Message Service) is the transmission of short text messages to and from a mobile phone, or any other device capable of generating the SMS. It is composed of a maximum of 160 characters, each coded on 7 bits (GSM) or 140 bytes. * End to end SMS delivery completes in two parts, First SMS submission in SMSC (Short Message Service Centre) by originating subscriber, second Delivery of SMS to recipient subscriber. So SMS is a Stored and Forward Service. * Once a message is sent, it is received by a Short Message Service Centre (SMSC) of the calling subscriber’s network, which then delivers it to the appropriate destination device. In the GSM SMS delivery, SMS termination does not require the SMSC of the recipient subscriber’s Operator. However In CDMA (Code Division Multiple Access) network or GSM to CDMA SMS transfer, or in case of some services like Push SMS, the recipient SMSC is also used for terminating the SMS to the recipient. In all these types of SMS transfer, the air interface-signalling channel is extensively used for terminating the SMS traffic. * SMS uses the signaling channel (not dedicated), so it can be sent/received simultaneously with the voice/data/fax service over a network. SMS Text Length:
The “short” part refers to the maximum size of the text messages: 160 characters (letters, numbers or symbols in the Latin alphabet). For other alphabets, such as Chinese, the maximum SMS size is 70 characters. Types of SMS :
With the growing convergence Technology of networks and services, SMS can be send from a mobile phone, fixed phone, or even via the Internet. On the basis of originating and terminating identities, SMS can be broadly classified into the following 4 categories : P2P, A2P, P2N & I2P. * P2P (Person to Person) : In Person to Person (P2P) mode, the SMS is between two individual subscribers. The SMSC or originating operator stores the SMS & sends it to the recipient, either directly or in case of GSM to CDMA or...
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