Matrix ETERNITY NE System Manual 481
CO Call Waiting
What's this?
The CO Call Waiting feature gives indication to the extension user about another waiting call on a Trunk, when this 
extension is in speech. 
This is a “Class of Service (COS)” dependent feature. Only those extensions which have this feature enabled in the 
COS allowed to them, will be given incoming call waiting indication on the trunk.
How it works
• A and B are extensions. 
• CO Call Waiting feature is enabled in the Class of Service of B but not on A.
• There is an incoming call on a trunk for B.
• B is busy on a call with A.
• ETERNITY plays Beeps to B to indicate the call waiting.
• To answer the waiting call, B may dial Flash or press the HOLD key.
• B will be connected to the caller.
• A will be put on hold.
• When there is an incoming call on a trunk for A, but A is busy on another call, A will not be provided any 
indication of the waiting call. 
How to configure
For CO Call Waiting to work on an extension, it must be enabled in the Class of Service allowed to that extension. 
By default, CO Call Waiting is disabled in the Class of Service of all Extension types: SLT, DKP, SIP. You may 
enable this feature on extensions which you want to provide CO Call Waiting indication. 
For instructions, see “Class of Service (COS)”, and the description for configuring the different Extension types 
under “Basic Settings”.
Keep this feature disabled, if you want to provide Privacy from Trunk Call intrusion beeps to an extension type. See 
“Privacy” to know more.