From: "PEAR Announce" on
The new PEAR package Net_SMPP-0.4.5 (beta) has been released at

Release notes
Fixed a bug which meant vendor packets were ignored
Added more PDU definitions
Added an example implementation under docs

Package Info
Net_SMPP is an implementation of the SMPP (Short Message Peer-to-Peer) v3.4 protocol. SMPP is an open protocol used in the wireless industry to send and recieve SMS messages.
Net_SMPP does not provide a SMPP client or server, but they can easily be built with it.

Related Links
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Simon Spencer (lead)