hysical SIP trunk delivery, service provider UNI compliance, 109 statistics, 110 provider offerings, assessing, deployment scenarios. See also deployment steps for SIP trunks TDM-equivalent feature avail- ability, identifying, 249-250 troubleshooting procedures, SRST, 224-225 specifying, 252 Tcl scripting, 229-232 Cisco UCM deployment, best Telepresence business-to-busi- practices, 259-260 ness interconnect, 233-235 migration, planning for, 244 TLS, 232-233 cost analysis, 245 transcoding, 225-227 emergency call policy, 246 with ZBFW, 227-229 future new services, evaluating, SIP trunks for PSTN access, 192 Cisco UCM H.323 network design implications Interconnect, 202-204 assessing, 246 Cisco UCM SIP to AT&T production user community FlexReach SIP trunk, 192-197 phases, defining, 246-247 contact center SIP trunk security implications, interconnect, 206, 209-211 evaluating, 248 CUCM to Verizon SIP trunk, traffic volumes, assessing, 246 197-202 pilot trial, 252 sharing SIP trunks across clear success criteria, defining, enterprise, 204-206 SMB SIP trunk for PSTN access, length of trial, specifying, 253 212-223 organizational responsibility, deployment steps for SIP trunks assessing, 253 available SIP trunk offerings, test plan, executing, 254-255 evaluating, 248 user community participation, call load balancing, evaluating, production service, 256 DID porting realities, SBC, best practices, 260-261 assessing, 249-251 Ethernet switches design considerations, 102 desktop handsets, 15-16 device monitoring, SIP trunking for echo, 128 SP networks, 74-75 edge SBCs (Session Border dial peers, example configurations, Controllers), SIP trunking for SP 272-273 networks, 58-59 DID number portability, emergency call handling, evaluating, 88-89, 249-251 Digest Authentication, 123 emergency call policy, 246 direct media model, 96-97 emergency call routing, 105 distributed SIP trunking model, 85-86 emergency services, SIP trunking for call patterns, 94-95 SP networks, 69 case study, 274-295 encryption, 124 cost, 92 encryption inter