Linksys SPA VOIP phone rejects calls from Skype SIP Trunk on Asterisk


  • Asterisk Trixbox 2.6 Server
  • Skype Connect SIP trunk to accept incoming Skype calls
  • Linksys SPA and Cisco SPA VOIP phones


Incoming calls via Skype to some Linksys / Cisco IP phones get rejected. Asterisk debug show following reason :

-- Called 715
-- Got SIP response 406 "Not Acceptable" back from
-- No one is available to answer at this time (1:0/0/0)


Issue was caused by enabled Block Anonymous Call option on Linksys SPA devices. On some firmware versions it seems to be enabled by default, on others not.


This can be disabled in two ways:

  1. Via web interface:
    • User > Block ANC Setting: NO
  2. Via phone menu:
    • Preferences > Block Anonymous Call > NO

Skype SIP Connect
Linksys SPA962
Linksys SPA 942
Cisco SPA 504G


Jeremy R
# Jeremy R 2014-08-27 20:46
This was exactly what I needed. Thank you!
Mike W
# Mike W 2014-07-15 00:53
Thanks for this! I set it way back when and couldn't figure out why my other extensions were ringing and one wasn't


Subscribe to receive occasional updates on new posts.
Your email will not be used for any other purpose and you can unsubscribe at any time.
Please wait