I am not sure that I understand why this binary package is used with Squeeze, regardless of the kernel. This package is extensively using OpenSSL and it is very sensitive to the binary compatibility with OpenSSL libraries. The errors look exactly like something is wrong with the OpenSSL libraries compatibility.
There is not much else information in the stack trace - the problem happens somewhere withing OpenSSL. If you want to use it with Squeeze, then you have to compile coturn from binaries. Oleg
