Would certifying for CCNP renew CCNA Voice certification? This is what their website says:
"CNA Voice certifications are valid for three years. To recertify, pass a CCNA Concentration exam (wireless, security, voice), or pass any 642 - XXX professional level ..."
Yes, in fact, passing any one of the CCNP exams will recertify your CCNA Voice as the CCNP exams are 642 professional level exams.
Hope this helps.