Have a look at the following info for how to make certain button "Flash Only";
To associate ephone-dns with individual buttons on a Cisco Unified IP phone and to specify line type or ring behavior, use the button command in ephone configuration mode. To remove an ephone-dn association from a button, use the no form of this command.
Number of a line button on a Cisco Unified IP phone that is to be associated with an extension (ephone-dn).
The maximum number of button-ephone-dn pairs is determined by the phone type.
Single character (:, b, c, f, m, o, or s) that denotes the characteristics to be associated with this phone button. Valid entries are as follows:
: (colon) Normal ring. For incoming calls on this extension, the phone produces audible ringing, a flashing ((< icon in the phone display, and a flashing red light on the handset. On the Cisco IP Phone 7914 Expansion Module, a flashing yellow light also accompanies incoming calls.
b Beep but no ring. Audible ring is suppressed for incoming calls, but call-waiting beeps are allowed. Visible cues are the same as those described for a normal ring.
c Call waiting. Provides call waiting for secondary calls to an overlaid ephone-dn. See also the o keyword.
f Feature ring. Differentiates incoming calls on a special line from incoming calls on other lines on the phone. The feature-ring cadence is a triple pulse, as opposed to a single pulse for normal internal calls and a double pulse for normal external calls.
m Monitor mode for a shared line. Visible line status indicates in-use or not. Line cannot be used on this phone for incoming or outgoing calls.
o Overlay line. Multiple ephone-dns share a single button, up to a maximum of 25 on a button. See also the c keyword.
s Silent ring. Audible ring and call-waiting beep are suppressed for incoming calls. The only visible cue is a flashing ((< icon in the phone display.
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