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UC320 SIP trunk configuration for (Switzerland)


Tested by: Calistus Che,

UC320W FW release: 2.1.1(7) with Region Pack for Switzerland

  • Provider: Generic SIP Provider
  • Description: sipcall
  • Proxy:
  • Registration:  Checked (Client-server SIP  trunk, registration required)
  • Outbound Proxy:
  • Call  Capacity: 12
  • Prefix # w/"+41" : Uncheck (uses UK national numbering plan)
  • Company  Name: <Your company name> (this will appear as the Display Name field on SIP messaging)
  • Account  ID:  <Account Phone number as provided by  the ITSP>
  • SIP domain name:
  • Authentication  ID: <Same as Account ID>
  • Password:  <As provided by the ITSP>
  • SRV  Recorded Lookup: Uncheck
  • SRV Auto Prefix: Uncheck
  • NAT Mapping: Uncheck
  • Send NAT Keepalive: Uncheck

Systemwide parameters

  • Codec: G711a/G729
  • Outbound FAX:  T.38/Passthrough

Known issues with tested release:

  • Issues with incoming calls forwarded to external numbers, no audio
  • Issues with fax reception, both T.38 and pass through
  • Issues with incoming call transfer from IP phone to analog phone