AS Feature Events
The patch also enables support for Do Not Disturb and Call Forward synchronization using Application Server Feature Events (open_in_browser ECMA-323). Listed below are the per-vendor configuration options required.You do not need to make any changes in sip.conf to enable this feature.
Polycom link
<polycomConfig>
<reg ... reg.1.serverFeatureControl.cf="1" reg.1.serverFeatureControl.dnd="1" />
...
</polycomConfig>
Cisco SPA and Multiplatform Firmware link
<flat-profile>
...
<Feature_Key_Sync_1_>Yes</Feature_Key_Sync_1_>
</flat-profile>
SNOM link
<settings>
<phone-settings>
...
<dfks>on</dfks>
</phone-settings>
</settings>
Aastra link
...
sip line1 as-feature-event subscription: 1
Yealink link
...
bw.feature_key_sync = 1