4. Signalling of Operational Statuses

2N IP intercom generates sounds to signal switching and changes of operational statuses. Each status change is assigned a different type of tone. See the table below for the list of signals.



Call prolongation confirmation signalling
Calls are time-limited in 2N IP intercoms for security reasons (protection against blocking). Refer to the Miscellaneous subsection for details.

Internal application launched
The internal application is launched upon 2N IP intercom power up or restart. A successful launch is signalled by this tone combination.

Connected to LAN, IP address received
2N IP intercom logs in upon the internal application launch. A successful LAN login is signalled by this tone combination.

Disconnected from LAN, IP address lost
This tone signals UTP cable disconnection from 2N IP intercom. Disconnection is signalled by this tone combination.

Invalid telephone number or invalid switch activation code
2N IP intercom allows the user to dial an extension number directly using the keypad or enter the door unlocking code. An invalid code is signalled by this tone sequence.

Default reset of network parameters
Upon power up, a 30 s timeout is set for the default reset code entering. Refer to the Device Configuration subsection in the 2N IP intercom Installation Manual for details.

Call end signalling
2N IP intercom enables the user to set a call end timeout to avoid call blocking. Press a key on your VoIP phone to extend the call time during this timeout. The purpose of the timeout setting is to avoid call blocking.

Connected VoIP phone
This short tone signals successful connection between a VoIP phone and 2N IP intercom.


  • Signalling of some of the above mentioned statuses can be modified; refer to the User Sounds subsection.