Release notes state this is supported.
Trying to get the extension 6491 to appear on pool 25 with no luck. See error below;
voice register pool 25 <<<<<<<<SIP PHONE
busy-trigger-per-button 2
id mac 8478.ACE6.27B1
type 8961
number 1 dn 25
template 1
codec g711ulaw
no vad
ephone-dn 150 octo-line <<<<<<<<<<<<<SCCP DN
number 6491
label 6491 - Open, Open
description +19048186491
name Open, Open
call-forward busy 6010
call-forward noan 6010 timeout 20
ephone-dn-template 1
3925#config t
Enter configuration commands, one per line. End with CNTL/Z.
3925(config)#voice register pool 25
3925(config-register-pool)#nu
3925(config-register-pool)#number 2 ?
dn Define a dn tag
3925(config-register-pool)#number 2 dn 150
voice register dn [150] not configured.
3925(config-register-pool)#
