ll, and SIP trunk configurations were given, and an IAD config for connecting to a traditional key system or PBX. The last section of the chapter provided short configuration extracts as helpful hints for further customization of the more basic configuration given earlier in the chapter. The implementation information in this chapter with the architectural, design, and func- tionality discussions in earlier chapters should enable you to deploy and implement a SIP trunk into your network. The next chapter summarizes overall best practices, and that is followed by a case study providing further information on how best to go about deploying SIP trunks. Further Reading The following documents and references provide additional information on the topics covered in this chapter. Service Provider SIP Trunk Interconnectivity SIP trunk interoperability configuration examples between various SPs' offerings and the CUBE are provided at www.cisco.com/go/interoperability > Cisco Unified Border Element. Configurations examples are posted as they become available and provide guidance for ease of configuration and installation. Some documents reflect testing done in Cisco labs 242 SIP Trunking with access to the SP's SIP trunk; other documents reflect testing done by the SP in its own labs. CUCM Connectivity to SIP Trunks The CUCM Solution Reference Network Design (SRND) document provides coverage of CUCM SIP trunks both for interenterprise connectivity and for connectivity to CUBE for external SIP trunks for PSTN access: Document: Cisco Unified Communications SRND based on Cisco Unified Communications Manager 7.x Location: www.cisco.com/go/srnd > Unified Communications > Unified Communications Manager > View Design Guide Chapter: Cisco Unified CM Trunks > SIP Trunks Chapter: Cisco Unified CM Trunks > Cisco Unified Border Element Contact Center Connectivity to SIP Trunks The Cisco Voice Portal Solution Reference Network Design (SRND) document provides coverage of SIP trunk connectivity with gateways. Document: Cisco Unified Custo