I’m wondering what exactly the following commands from my core switch are accomplishing. I see only the following references, but no ACL definitions or any other references to these mapped names anywhere else in the configs. What are they doing? class-map match-all REYCM_EDGE_PORTS match ... More on community.spiceworks.com

Class maps are used to build a policy map. The class-map typically contains some set of rules of what you're trying to match (e.g. match traffic against this access-list, match traffic with a certain DSCP marking, etc.). The policy-map references the class-maps and then adds some action, like setting a bandwidth limit. The class-maps can be re-used in different policy-maps, policy-maps can also be nested/contain other policy-maps. class-map match-any VOICE match ip dscp ef match ip dscp af31 match access-group name VOICE-NETWORKS class-map match-any ROUTING match ip dscp cs6 Here I have two class maps. These are both "match-any", meaning if any of the rules defined are matched, then the class-map as a whole is matched. If you're familiar with boolean logic, this would be an OR statement. You could also do a "match-all", where all the match statements have to be true for the class-map to be a match. "match-all" would be a boolean AND. policy-map WAN-QoS-Policy class VOICE priority percent 25 class ROUTING bandwidth percent 3 Here I have a policy-map, which is calling the previous class-maps for VOICE and ROUTING. In this policy map, I'm doing some QOS stuff, where traffic matching the VOICE class map would get a certain QOS policy applied (priority percent 25), and traffic matching the ROUTING class map has a different QOS policy applied (bandwidth percent 3). Because its modular, I could create a different policy-map and keep using the same class-maps, if I wanted to keep using those matching patterns but apply a different action to them (maybe I have two WAN circuits with different bandwidths so I need to change my QOS policies. policy-map WAN-QoS-Policy-HighBandwidth class VOICE priority percent 5 class ROUTING bandwidth percent 1 policy-map WAN-QoS-Policy-ShittyCircuit class VOICE priority percent 50 class ROUTING bandwidth percent 10 None of this does anything without these policies actually being applied somewhere, so you still need to figure out where you want these policies to take effect interface gig0/0 service-policy output WAN-QoS-Policy-HighBandwidth interface gig0/1 service-policy output WAN-QoS-Policy-ShittyCircuit As for your SIP questions, if it's a router there should be a SIP-UA section, there may be a destination server defined there. You may also have a SIP destination defined under dial-peers, if you have any dial-peers defined. There's also some config at the top with voice classes. Look for any commands that mention something like binding or source, that would be telling the router to use a specific interface/IP when handling voice traffic. The syntax is different if its SIP vs. h323 or MGCP, but they all involve terms like source interface or bind More on reddit.com