Configuring Sipura / Linksys SPA 3000 ATA VOIP Adapters for the UK

This article describes how to configure the following VOIP devices for the UK: Sipura ATA 1001, 3000, 3012 etc. and Linksys IP Phones and ATA’s  – SPA 841/941/PAP2t.

Sipura / Linksys VOIP ATAs come configured for US telecoms: some changes need to be made in order to hear the correct tones for UK systems and to ensure compatibility with PBXs set up for the UK.

1. Browse to the web UI of the device, select the admin login and switch to the advanced view.

2. Change the following values on the Regional tab to support UK tones and alerts

Call Progress Tones

  • Dial tone: 350@-19,440@-22;10(*/0/1+2)
  • Ring back: 400@-20,450@-20;*(.4/.2/1+2,.4/2/1+2)
  • Busy tone: 400@-20;10(.375/.375/1)
  • Reorder tone: 400@-20;10(*/0/1)
  • SIT 1 tone: 950@-16,1400@-16,1800@-16;20(.330/0/1,.330/0/2,.330/0/3,0/1/0)
  • MWI dial tone: 350@-19,440@-22;10(.75/.75/1+2)
  • CWT1 cadence: 30(.1/2)
  • CWT2 cadence: 30(.25/.25,.25/.25,.25/5)
  • CWT frequency: 400@-10
  • Ring 1 cadence: 60(.4/.2,.4/2)
  • Ring 2 cadence (used for BT Call Sign): 60(1/2)
  • Ring 3 cadence (used for BT Ring Back): 60(.25/.25,.25/.25,.25/1.75)
  • Ring 4 cadence: 60(.4/.8)
  • Ring 5 cadence: 60(2/4)
  • Time Zone: GMT
  • FXS Port Impedance: 370+620||310nF
  • Caller ID Method: ETSI FSK With PR(UK)
  • Daylight Saving Rule: start=3/-1/7/2:0:0;end=10/-1/7/2:0:0;save=1:0:0

PSTN line settings for SPA-3000

PSTN Disconnect Detection

  • Detect CPC: yes
  • Detect Polarity Reversal: no
  • Detect PSTN Long Silence: yes
  • PSTN Long Silence Duration: 30
  • Min CPC Duration: 0.09
  • Detect Disconnect Tone: yes
  • Disconnect Tone: 400@-30;20(*/0/1)

International Control

  • FXO Port Impedance: 370+620||310nF
  • On-Hook Speed: 3ms (ETSI) (seems right – UK is ETSI)
  • Current Limiting Enable: yes (seems right – UK should be approving to CTR21)
  • Ring Validation Time: 256ms
  • Ring Indication Delay: 0
  • Ring Timeout: 12


We will be adding further info on configuring these units, specifically configuring the dial plan which the device uses to know how to treat incoming and outgoing calls, e.g. routing via SIP or PSTN, forwarding calls, blocking prefixes etc. While there are many websites out there with good information on this, we will be concentrating on setups which are more specific to the UK.