So there's an update here... finally I find out that all of the errors I got finally refers to one error. This is: missing finction posix_openpt(), witch would be declared in stdlib.h. This why zaptel's ztdummy (got it from other package repository) cannot be used. When meetme conference starts asterisk write an error: unable to pseudo device.
I'm thinking of get the body of the function and paste it to stdlib.h, but I'm afraid it won't work, cause it's some kind of kernel stuff.
If anyone has any idea, share it with me, please!
More info on the funtion:
http://www.opengroup.org/onlinepubs/...ix_openpt.html
http://linux.die.net/man/3/posix_openpt