Panasonic KX-TD816NZ - Manual (Page 99)

2.8 Using User-supplied Equipment
Operation
99
2.8.2 If a Host PBX is Connected
Accessing external services (External Feature Access)
You can access special features (e.g. Call
Waiting) offered by a host PBX or Central
Office. This feature is only effective with an
outside call.
• If you programme "EFA" (External Feature Access) to the FLASH button by system