le 10-24 SIP Session Transport Configuration voice service voip session transport tcp QoS Remarking One of the functions of an SBC is to control the QoS markings on the voice flows between networks. It might be that the default markings are sufficient, but if a translation is required between your network and the SP's network, CUBE provides handy tools to remark the packets as they pass through the border. Example 10-25 shows how to do this on the outgoing dial-peer. Example 10-25 QoS Packet Remarking dial peer voice 2 voip ip qos dscp cs5 media ip qos dscp cs3 signaling SIP User Agent Parameters Many global SIP parameters are configurable under the sip-ua portion of the Cisco IOS configuration. This is also where you can tune the retry timers to control overall post-dial delay imposed on calls failing over from one dial-peer to another. Example 10-26 shows how to configure this. Example 10-26 SIP User Agent Parameters sip-ua retry invite 2 retry bye 2 retry cancel 2 Troubleshooting Helpful show and debug commands for general SIP call-related information include show call active show sip call show voip rtp conn debug ccsip message/all debug voip ccapi inout debug voip rtp session named events Chapter 10: Deployment Scenarios 241 Helpful show and debug commands for CAC related information include show call threshold config show call threshold stats show call threshold status debug call threshold detail debug call threshold core debug call treatment action Summary This chapter provided a significant amount of information on how to deploy and imple- ment SIP trunk termination into an enterprise or SMB network. Two specific SP connec- tion examples were given that can be customized for other providers who might have slight variations in their offerings. Additional configurations were given for various common deployment variations such as older CUCMs or IP-PBXs capable only of H.323 (and not SIP), Telepresence traffic, collo- cated SRST, and firewall configurations. For the SMB, integrated single-device IP-PBX, firewa