I guess I do not understand "Subscribe CSS" I have the newly added phones on the same CSS as the ones that are working and do not have a Subscribe CSS in the call manager.

BLF won't work without Subscribe CSS.

You may go to CUCM > Device > Phone and find a phone that has BLF working.  You may find the Subscribe CSS from the phone's configuration.

In short, Subscribe CSS needs to be able to reach the DN that being monitored.

Michael

BLF works here without Subscribe CSS !

If the monited DN in "none" partition, of course you don't need CSS. 

As you can see in the screen

shot I have sent on the Directory Number Configuration page the Partition is Local and the CSS is LongDistance_CSS and it works just fine with the phone in CCM that are configured this way. I have the newly added phone configured this way and BLF does not work.

I don't see any screenshots.

Subscribe CSS could be configured in device or line level.  If visual inspection didn't come up with anything, you'll need CCM logs to debug.

Michael

Hi Mojo,

The fact that you only see the keypad icon definately suggests that the monitored DN status cannot be determined, and this is usually due one of two reasons as suggested in earlier post.  It could be attributed to either the device being a difference presence group other than the default standard presence group, if you have created any or it simply the Subscribed CSS is also different.

Can you confirm that the IP Phones where BLF is working that monitored DN is within the same partition to that of the DNs on the phone's where it is not working.  Therefore simply make a comparison between the working BLF IP Phone and the Non working BLF Phone, is there any characteristics which are different regarding the presence group and Subscriber CSS?  As a test, could you simply create a new CSS called CSS-Presence for example and add only the partition which is associated with each of the monitored DNs, then assign this as your Subscribe CSS on each device.

If you could provide screens shots of the device and line for the working BLF IP Phone and the non-working BLF phone, then we can also determine if any aspect is configured differently.

Thanks

Allan.