Grandstream UCM6100 User Manual for 1.0.9.25 - Manual (Page 222)

Firmware Version 1.0.9.25 UCM6100 Series IP PBX User Manual Page 221 of 303
BUSY CAMP-ON
Starting from firmware 1.0.8.11, the UCM6100 supports busy camp-on/call completion feature that allows
the PBX to camp on a called party and inform the caller as soon as the called party becomes available
given the previous attempted call has failed.
The configuration and instructions on how to use busy camp-on/call completion feature can be found in the
following guide:
http://www.grandstream.com/products/ucm_series/ucm61xx/documents/ucm6100_busy_camp_on_guide.
pdf