Updated osplibversion.h and RELNOTES.txt to prepare 4.4.1.
Merged branch 4.4 changes to 4.4.0 into trunk.
Version 4.4.0
Added support for User-Agent.
Created branch 4.4.
Updated osplibversion.h and RELNOTES.txt to prepare 4.3.1.
Merged branch 4.3 changes to 4.3.0 into trunk.
Version 4.3.0
Added support for CDR proxy, total setup attempts and From display name.
Create branch 4.3.