I have a Cisco 4451 router, that is on version Cisco IOS XE Cupertino 17.9.2a we are trying to set up voip however we can not find any of the usual commands like "voice service voip", "dial-peer" and ect. we see the version supports SIP, can someone help us figure out why the router is saying those are not commands? We received the router on version 17.6.2 and updated to the 17.9.2 that it is on now.
