How do I adjust the timer for IC calls forwarding to voicemail without messing up all the other forwarding timers in the system?

I have unanswered IC calls being forwarded to voicemail, but it takes 10 rings before the call goes which is way too long. Regular calls go to voicemail in only about 4-5 rings which is sufficient.

I'm aware of the "System Forward Initiate" timer and the 2 "No-Answer" timers, but I'm betting they will change everything - not just IC calls.

I heard about using a separate forwarding path for IC calls, but I'm not sure how to set that up.

System is Axxess 9.1 with EM.

I appreciate any and all help,

Rx