Signaling protocol

Last Updated : Apr 17, 2026 |
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Signaling protocol is a type of communication protocol used for changing the signaling value to either SIP or H.323. Depending on the signaling value selected, it specifies the software used and controls the requests for the specific upgrade file.
Following are the methods used for changing the protocols for the enterprises requiring both H.323 and SIP-based protocols :
  • The phone UI in the administration menu. Refer to Updating the signaling protocol in Related links.
  • Updating the SIG parameter using:
    • The 46xxsettings.txt file. Refer to Parameters for signaling protocol in Related links.
    • DHCP Option 242 (Site-Specific Option Number) or DHCP Option 43. See DHCP options in Related links.
When you change the protocol, there are few configuration parameters such as Group and SSON which are retained while upgrading to either SIP or H.323.
Note:
You must extract the software distribution package in the file server directory.
Related information
Configuring the phone using Administration menu
Updating the signaling protocolParameters for signaling protocol
DHCP options
Updating the signaling protocolParameters for signaling protocol