Enhanced Feature Key (EFK) buttons
Adding EFK buttons to Polycom phones is fairly simple to do provided you are familiar with how to program EFK buttons and how to edit Polycom XML configuration files. A detailed PDF on creating EFK's can be found here. A common scenario for this is adding a Blind Transfer button while in a call. The first thing you have to do is ensure enhanced-feature-keys is checked under the Features section of the phone or group of phones in sipXconfig for which you wish to enable this feature.
Once you have this setting checked you will need to modify /etc/sipxpbx/polycom/polycom_sip.cfg and add in the EFK XML.
Be sure to back this file up before editing. Changes to this file affect all Polycom phones that are configured in sipXecs. Proceed with caution.
The following is an example of the EFK configuration for adding a Blind Transfer button:
<efk>
<version efk.version="2" />
<efklist
efk.efklist.1.mname="blndxfer1"
efk.efklist.1.label="Blind Transfer"
efk.efklist.1.status="1"
efk.efklist.1.action.string="$P1N4$$Trefer$"
/>
<efkprompt
efk.efkprompt.1.status="1"
efk.efkprompt.1.label="Extension: "
efk.efkprompt.1.userfeedback="visible"
efk.efkprompt.1.type="numeric"
/>
</efk>
<softkey
softkey.1.label="BlindXfer"
softkey.1.action="!blndxfer1"
softkey.1.enable="1"
softkey.1.precede="1"
softkey.1.use.idle="0"
softkey.1.use.active="1"
softkey.1.use.alerting=""
softkey.1.use.dialtone=""
softkey.1.use.proceeding=""
softkey.1.use.setup=""
softkey.1.use.hold="1"
softkey.feature.newcall="1"
softkey.feature.endcall="1"
softkey.feature.split="1"
softkey.feature.join="1"
softkey.feature.forward="1"
softkey.feature.directories=""
softkey.feature.callers=""
softkey.feature.mystatus="1"
softkey.feature.buddies="1"
softkey.feature.basicCallManagement.redundant="0"
/>
To enable the EFK, send profiles and restart phones.