SMS API product for linux platform

Archived from groups: alt.cellular.nokia,alt.cellular.tech,alt.cellular.gsm (More info?)

I am currently working on a project which involves developing an SMS
API to interface to some of my applications (mostly written in php).
The SMSC's which we would be connecting to has SMPP 3.3/SMPP 3.4
installed.

I am looking for a middelware component which would allow me to
connect my applications to the Short Messaging Service Centers (SMSCs)
of mobile networks.

I found some products for linux platform on the net. But I need some
advice (from your experience) on any good products available on the
market.

Any help will be greatly appreciated.

regards
Yamuna