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VoIP Phones - Cisco SPA

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Cisco SPA120 & SPA122

SPA112.jpg
  • 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.


CiscoSPA-0-Status.png

View of the 'quick settings'

CiscoSPA-1-Line.png

Line Settings

CiscoSPA-2-Line1.png

CiscoSPA-2-Line2.png

CiscoSPA-2-Line3.png

CiscoSPA-2-Line4.png

SIP Settings

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

CiscoSPA-3-SIP1.png

CiscoSPA-3-SIP2.png

Regional Settings

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

CiscoSPA-5-Regional.png


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.