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Location B

Current Situation. PBX. PSTN. PBX. Location A. Location B. Direct link. PBX. Location C. Transient situation. 112. 211. 111. PBX. PSTN. 212. PBX. 113. 213. Location A. Location B. Direct link. 311. PBX. Location C. 312. 313. Transient situation: Phone to phone.

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Location B

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  1. Current Situation PBX PSTN PBX Location A Location B Direct link PBX Location C

  2. Transient situation 112 211 111 PBX PSTN 212 PBX 113 213 Location A Location B Direct link 311 PBX Location C 312 313

  3. Transient situation: Phone to phone 112 211 111 PBX PSTN 212 PBX 113 213 Location A Location B Direct link 311 Call 112 PBX Location C 312 Call 213 313

  4. Transient situation: PC to phone 112 211 111 PBX PSTN 212 PBX 113 213 Location A Location B Direct link Call 213 311 PBX Location C 312 313

  5. Evolved situation PBX PSTN Location A Location B Direct link Location C

  6. Setup call Call <#CLI> Network topology & status 1. Find origin 2. Find destination 3. Select best available route VPN Features. Efficient call routing Virtual Private Network

  7. Setup call Orig. 3375111 Call 111 Dialling rules Called # Translated # 11? 337511? 22? 336522? 23? 425545? VPN Features. Abbreviated dialling Virtual Private Network

  8. Setup call Orig. 3375111 Call 4441524 Filtering rules Called # Origin Allow? 444???? 11? 3224??? ??? Rest 1?? VPN Features. Call filtering (I) Virtual Private Network

  9. Denied access to 3224524 Your telephone is not allowed to call that number Call 3224524 Filtering rules Called # Origin Allow? 444???? 11? 3224??? ??? Rest 1?? VPN Features. Call filtering (II) Virtual Private Network

  10. VPN Features. Unified billing PSTN 111 - 113 - 07:20 111 - 214 - 02:20 314 - 214 - 10:20 314 - 113 - 15:19

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