Citel has recently released new firmware which corrects several issues with the C4110 SIP/IAX Phone.

You can download the latest firmware below. NOTE: the file is a .z file which will directly load to the phone; you don’t need to unzip it.

Citel C4110 Firmware Link

Amongst the issues corrected in this firmware release are:

  • Daylight saving time now works properly for SNTP settings. The default dates are now correct for the USA.
  • Improved DTMF
  • Config download via FTP/HTTP now working on the AUTO PROVISION interface.

The Citel C4110 supports both SIP and IAX2 protocol, and is now shipping at