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UC320W SIP Trunk Configuration for Telecom Liechtenstein

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Tested by Büchel Ernst,Telecom Liechtenstein

UC320W FW release: 2.2.2(1)


  • Provider: Generic SIP Provider
  • Description: Telecom Liechtenstein AG
  • Proxy: sip-pbxd.telecom-liechtenstein.ch
  • Registration: Checked (Client-server SIP trunk, registration required)
  • Outbound Proxy: sip-pbxd.telecom-liechtensteinc.ch
  • Call Capacity: 12 
    • Prefix # w/"+41" : Uncheck
    • Company Name: <Your company name> (this will appear as the Display Name field on SIP messaging)
    • Account ID:  <As provided by the ITSP>
    • SIP domain name: <blank>
    • Authentication ID: <Same as Account ID>
    • Password: <As provided by the ITSP>
    • SRV Recorded Lookup: Uncheck
    • SRV Auto Prefix: Uncheck
    • NAT Mapping: Checked(ITSP provides SBC/Outbound proxy)

    Systemwide parameters

      • Codec: G711
      • Outbound FAX:  Passthrough
      • WAN: Static Address from ITSP

      Known Issues:

      * T38 Faxing does not work

      * With T.38 after Re-Invite the UC320 reboots.