CDMA stands for 'code division multiple access'. It is the alternative standard to GSM for use with cell phones. 2SMS integrates with both CDMA and GSM standards.

GSM stands for 'global system for mobile communications'. It is the most common standard adopted for use with cell phones. 2SMS integrates with both CDMA and GSM standards.

SMTP stands for 'simple mail transfer protocol'. It is the technology that is used to send emails over the Internet.

SMPP stands for 'short message peer-to-peer protocol'. It is the technology that 2SMS uses to connect to the global cell phone network and send your text messages. It provides an interface to send text messages on both GSM and CDMA networks.

SMS stands for 'short message service'. It is the technology that enables text messages to be sent to your cell phone.

SNPP stands for 'simple network paging protocol'. It is a technology used to send messages to paging devices. The pager replacement option will receive SNPP messages and convert them to cell phone text messages. It thus allows an organization to retain its existing message sending infrastructure, while allowing the message receiving system to be replaced by cell phone text messaging.