Data only means that the router does not support terminating voice channels, hence it cannot be used with any PBX, QSIG or not.
The smaller router model that supports QSIG and more is called 1861. You also need a PVDM2-xx where xx is the number of voice channel you intend to handle (8, 16, 32, 48 or 64).
Hope this helps, please rate post if it does!