VoIP Phones - Cisco SPA

Back up to the VoIP Configuring page
From AAISP Support Site

Cisco SPA120 & SPA122

  • This is similar to the older Linksys PAP2T ATA
  • Ensure software is updated, as this does help with the quality of the audio, we upgraded to 1.3.2-XU (014) Jul 2 2013
  • Blog post regarding this
  • Does seem to work will with the modems on Sky boxes to talk home on.

The screenshots here were taken from a SPA112 which was actually set up to give a Sky box a phone line to call home on.

In short, set it up without echo cancellation, a-law only, no fax detect, no jitter adjust (set to high), UK line impedance, zero gain, etc.

PLEASE NOTE: If your line has a noticeable echo, turning on echo cancellation may assist.

Do not use +44 as part of the username, otherwise the device will not register. You must use 0.


View of the 'quick settings'


Line Settings





SIP Settings

  • Change RTP Packet Size: to 0.020 (which is 20ms)



Regional Settings

  • Change FXS Output gain to -3 if modems have problems
  • Change the impedance setting to 370_630|310nF


Firewall & Security

  • You will also want to set up firewall rules, as per the VoIP Firewall page.
  • Also see the VoIP Security page for information about securing your VoIP service.