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NOTIFY
...
<?xml version="1.0"?>
<dialog-info
	xmlns="urn:ietf:params:xml:ns:dialog-info"
	version="..."
	state="full"
	entity="sip:101@...">
	<dialog id="..." >
		<state>trying</state>
	</dialog>
</dialog-info>

...
<NotifyParsingRules type="state">
	...
  	<level3
		translates_to="offhook">/dialog-info/dialog/state[.="trying"]
	</level3>
  	...
</NotifyParsingRules>
...
<action>
	<invite target="$(subscr_uri)"
		when="on press"
		states="idle"/>
	<invite target="$(remote_uri)"
		when="on press"
		state="ringing"
		request_uri="$(remote_uri)"
		replaces="$(call_id);to-tag=$(remote_tag);from-tag=$(local_tag)"/>
</action>

<ReplacementPlan>
	<!-- This defines the name of the entry in the Function Keys page under Type -->
	<key id="BLF-new">
	<general type="BLFSampleDefinition" />
		<initialization>
 		<!-- only add the UAS IP here, extension number is replaced from WUI as variable $(ui_argument) -->
		<variable name="subscr_proxy" value="10.110.22.35"/>
		<!-- initial value for the state variable: off means, that after bootup this button has state off -->
		<state value="off"/>
		</initialization>
		<!-- a subscription of event-type dialog will be initiated to the URI defined -->
		<subscription type="dialog" to="<sip:$(ui_argument)@$(subscr_proxy)>" for="$(ui_argument)@$(subscr_proxy)"/>
		<!-- checks if a SIP NOTIFY message belongs to this particular button
		level is ok, if the condition inside the tags is matched -->
		<NotifyParsingRules type="applies">
			<level1 translates_to='OK'>/dialog-info[@entity="sip:$(ui_argument)@$(subscr_proxy)"]</level1>
		</NotifyParsingRules>
		<!-- translates the button state based on the body of the SIP NOTIFY -->
		<NotifyParsingRules type="state">
			<level1 translates_to="ringing">/dialog-info/dialog/state[.="early"]</level1>
			<level1-1 translates_to="calling">/dialog-info/dialog[@direction="initiator"]</level1-1>
			<level2 translates_to="ringing">/dialog-info/dialog/state[.="proceeding"]</level2>
			<level2-1 translates_to="calling">/dialog-info/dialog[@direction="initiator"]</level2-1>
			<level3 translates_to="offhook">/dialog-info/dialog/state[.="trying"]</level3>
			<level4 translates_to="talking">/dialog-info/dialog/state[.="confirmed"]</level4>
			<level5 translates_to="idle"/>
		</NotifyParsingRules>
		<!-- Call pickup: fetch variable call_id from call-id of NOTIFY body -->
		<NotifyParsingRules type="variable" id="call_id" state="ringing">
			<level1 fetch_attribute="call-id">/dialog-info/dialog[@call-id]</level1>
        </NotifyParsingRules>
		<!-- Call pickup: fetch variable remote_tag from remote-tag of NOTIFY body -->
		<NotifyParsingRules type="variable" id="remote_tag" state="ringing">
			<level1 fetch_attribute="remote-tag">/dialog-info/dialog[@remote-tag]</level1>
		</NotifyParsingRules>
		<!-- Call pickup: fetch variable local_tag from local-tag of NOTIFY body -->
		<NotifyParsingRules type="variable" id="local_tag" state="ringing">
			<level1 fetch_attribute="local-tag">/dialog-info/dialog[@local-tag]</level1>
		</NotifyParsingRules>
		<!-- Call pickup: fetch variable remote_uri from uri of NOTIFY body -->
		<NotifyParsingRules type="variable" id="remote_uri" state="ringing">
			<level1 fetch_attribute="uri">/dialog-info/dialog/remote/target[@uri]</level1>
		</NotifyParsingRules>
		<action>
		 	<!-- Quick dial: depending in which states we want to allow this action -->
            <invite target="$(ui_argument)" when="on press" states="calling, talking, offhook, idle"/>
 		 	<!-- Pick up --> 
            <invite target="$(remote_name)<$(remote_uri)>" when="on press" state="ringing" request_uri="$(remote_uri)" replaces="$(call_id);to-tag=$(remote_tag);from-tag=$(local_tag)"/>
			<assign when="on notify" state="ringing">
     </action>				<source value="kIconTypeFkeyBlfRinging"/>
    </key>
</ReplacementPlan>

				<destination id="icon"/>
			</assign>
			<assign when="on notify" state="idle">
   				<source value="kIconTypeFkeyBlfIdle"/>
   				<destination id="icon"/>
 			</assign> 
 			<assign when="on notify" state="ringing">
   				<source value="kIconTypeFkeyBlfRinging"/>
   				<destination id="icon"/>
			</assign>
			<assign when="on notify" state="calling">
   				<source value="kIconTypeFkeyBlfCalling"/>
   				<destination id="icon"/>
			</

assign> 
 		

	<assign when="on notify" state="talking">
   				<source value="kIconTypeFkeyBlfTalking"/>
   				<destination id="icon"/>
			</assign>
		</action>
    </key>
</ReplacementPlan>