16 IMS for the Rest of US  AS – Application Server  SCIM - Service Capability Interaction Manager  MRFC - Multimedia Resource Function Controller  MRFP - Multimedia Resource Function Processor  MRF – Media Resource Function  CSCF- Call Session Control Function  BGCF - Breakout Gateway Control Function  MGCF - Media Gateway Control Function  MGW - Media Gateway  HSS - Home Subscription Server  HLR - Home Location Register Key Elements: HSS/HLR MRFC MRFP CSCF MGW SCIM S-CSCF I-CSCFP-CSCF BGCF MGCF MRF SIP RTP Application Servers
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