Do the RBOCs have requirements over and above NEBS?

Yes they do and here they are:

• at&t Requirements 
  • Here's a list of at&t NEBS Requirements
  • Here's a list of at&t Equipment Installation Requirements
  • Here's a list of at&t Technical References
    • My favorite is TR-73503 (Caution big download)
• Qwest
  • Here's a list of Qwest's Technical References
    • Check out 77350 (Caution big download)
    • All you want to know and more about Qwest's COs 77351 (Another big one)
    • Grounding in Qwest's CO 77355 (It's big too)
• Verizon
  • NEBS Compliance Clarification Document (May 2009)