I uploaded the packto7bits.sh script I used in Tuning Binary Messages so that you can repeat the example from that article.
You can find it on GitHub: Opaali / tools / packto7bits
(This can also be useful for other purposes – this week the newspapers reported about a job ad that was encoded as 7-bit SMS PDU code to attract suitable geeky applicants.)
JPLa is a member of the Content Gateway (CGW) to Opaali migration team, specialising in programming related issues and API usage.