Hi Jason,
Please check the following.
https://tools.cisco.com/bugsearch/bug/CSCtl23013/?reffering_site=dumpcr
Group pickup visual notification timer different on SIP and SCCP phones
CSCtl23013
Symptom:
The group pickup visual notification timer on SIP IP phones is the same as the "Call Park Display Timer" Service Parameter whereas for SCCP phones display the visual notification for only 10 seconds no matter what the value of the Call Park Display timer is.
Conditions:
N/A
Workaround:
None
HTH
Manish