and terminated the end in the office using a voice grade module:
The network interface device is terminated on a TII 95s series module (I think it's p/n: 95s-1-00-0). It looks like the module in this document:
For an outlet in a different room that terminates on the same TII module, DSL works great. With the one I'm adding, I can't get good continuity tests. In writing this post, I noticed that the voice grade module from Home Depot has a single (1-star) review. The reviewer indicates that he tried several of those modules (unsuccessfully). According to the reviewer, the wire insulation isn't pierced, so no contact/continuity.
I double-checked that I'm wiring the voice grade module correctly as well as the TII 95s module. Pairs and tip/ring are in the right place.
I think I'll try a different keystone jack / port.
Any other suggestions?