Keep Cisco Phones

CiscoIP phones stand proud on many a desk – they are good quality and look surprisingly good despite their age. Their problem – The Cisco Call Manager behind them; Cumbersome to manage, expensive to expand and yearly maintenance price is scary.

The solution – 3CX Phone System – a modern IP PBX that will unify your communications whilst leverage your existing CISCO IP Phones investment.


CISCO Phones with 3CX

Legacy phone support has been implemented to allow easy migration from an existing phone system to 3CX without the need to directly replace all existing IP phones. It is strongly recommended to not purposely buy these devices new or as a replacement. Legacy phone devices have a limited feature set and can only be supported up to a certain point by the 3CX Support Team – you may well need to contact vendor support directly for some matters.


Networking topology


cisco phones with 3CX
cisco phones with 3CX



Make sure the current Cisco phone is the SIP protocol, if not the SIP protocol. Need to upgrade Cisco’s SCCP protocol to SIP. What we can confirm now is that the 3900 and 7800 series are standard SIP protocols. The 6900 Series and 7900 Series may require a firmware upgrade. Please check out our related blogs during the upgrade process.

By setting up, Cisco phones can communicate with the 3CX system. Users do not have to re-purchase new IP phones, which protects the user’s original fixed assets investment. This allows the user to have a short buffer period when transitioning to the new system. However, we recommend using a 3CX certified phone later.




  • No PnP Support
  • No STUN Support
  • No SBC Support
  • No Full CTI Support (Make Call Only with no Auto Answer)
  • No BLF Functionality
  • No Company Phone Book
  • No Blind Transfer (7961 7941)
  • No local conference  (7961 7941 dial codes need to be used)
  • No Attended Transfer (7960 7940)
  • No Distinctive Ringing for external, queues or ivrs
  • Time Zone Support (NTP Server set to public IP)
  • Manual DST Support
  • No LCD Language Support
  • Can not be used for Assign and Clear Operation

Related Blog

How to install a TFTP server for Linux 3CX


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