See http://jira.freeswitch.org/browse/MODENDP-179 for how far I've gotten on doing SLA/BLA in the draft-anil-sipping-bla-02/03 style. If the patch is applied and the feature enabled and Polycom phones in use and the phones configured for type="shared" and thirdPartyName="<some extension>", the lights really work. And with a patch Anthony provided to me today to add support for INVITE w/REPLACES, you can even put a call on hold at one phone, go to another phone with a blinking light for that line, and pick it up. (But you can't pick up a second phone with the first still on the call and have them both join the call at the same time via an auto-created conference... yet) Amazing how much work it takes to emulate an old key system. Again, this is a total rough-draft hack of a prototype, just enough to get the lights working, and with at least one major memory leak and/or nua handle leak(s) that cause bad things to happen, so isn't for production at all yet. I will be continuing to work on it myself, but I know this is something that gets requests so I wanted to get the fact that I'm working on it out in the open ASAP. Matthew Kaufman