 found on Cisco.com. www.cisco.com/go/cube > Configure > Configuration Examples and TechNotes > Unified Border Element SIP TLS Configuration Example. Chapter 8: Interworking RTP Profile for Audio and Video Conferences with Minimal Control (RFC-1890). http://www.ietf.org/rfc/rfc1890.txt?number=1890. RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals (RFC-2833). http://www.ietf.org/rfc/rfc2833.txt?number=2833. The SIP INFO Method (RFC-2976). http://www.ietf.org/rfc/rfc2976.txt?number=2976. Session Initiation Protocol (SIP)-Specific Event Notification (RFC-3265). http://www.ietf.org/rfc/rfc3265.txt?number=3265, RTP Profile for Audio and Video Conferences with Minimal Control (RFC-3551). http://www.ietf.org/rfc/rfc3551.txt?number=3551 A Session Initiation Protocol (SIP) Event Package for Key Press Stimulus (KPML) (RFC-4730).http://www.ietf.org/rfc/rfc4730.txt?number=4730 RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals (RFC-4733). http://www.ietf.org/rfc/rfc4733.txt?number=4733. This page intentionally left blank Chapter 9 Questions to Ask of a Service Provider Offering and an SBC Vendor This chapter covers the following topics: Technical requirements Delivery, documentation, and support Quality Business This chapter explains the questions you should ask your service providers and Session Border Controller (SBC) vendors before you deploy Session Initiation Protocol (SIP) trunks and SBC into your network. It also explains the possible proper answers for the questions. The chapter also discusses the different issues and concerns you need to resolve and the different options you need to examine, and it guides you through select- ing the right partners for SIP trunks and SBC. Expectations of SBC are mostly set by the design of your network. However, it is impor- tant to understand the detail features that might be incorporated into your Request For Proposal (RFP). This chapter might not cover every single component of your RFP, but it does cover most of the requirements. Technical Requ