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S:

Short codes
SIM Card
SIP
SIP Trunking
SLA
SMPP
SMS
SMS Banking
SMS Delivery
SMS Gateway
SMS MO
SMS MT
SMS-C
SMTP
SOAP
SS7
SSL
 

SIP
SIP (Session Initiation Protocol) is an application-layer control (signaling) protocol. It is based on a text (ASCII) based protocol similar to HTTP. SIP also enables the delivery of converged services across multiple networks so that basic telephony and IP-based services can be used simultaneously.