[cisco-voip] 8.6.2, 7925 and speakerphone

[Beck, Andre]

Most. Mindboggling. Bug. Ever.

Suppose, after an initially successful upgrade of a CUCM cluster from
7.1.3 to 8.6.2.21900-5, you get increasing number of reports of users
who cannot place any calls any longer. Dialing simply stays stuck with
"Call in progress..." being displayed, but no call goes out. Of course
nothing of that happened before upgrade (7925s kept their firmware
versions exactly) or in testing.

Hours of hair-pulling later, we recognized the problem to correlate to
phones which had "disable speakerphone" configured - for years. Testing
revealed that to really be the trigger - disable another 7925's speaker
and it will be stuck in placing calls. Enable it again, and calls will
again work. According to wireless sniffing, the phone doesn't even send
the dialed number in skinny, just the Dial softkey appears in the trace.

Anyone ran into something like that? Neither Google nor Bug Toolkit
revealed anything, even though "disable speakerphone" wreaking unrelated
havoc is seemingly not unheard of.

That bugger exploded our 15min maintenance window by 3h, cost me a lot
of the remaining hair pigment and we were close to roll back the entire
cluster upgrade. How can something like that get past regression testing?

Done for the day,
Andre.
-- 
                    Cool .signatures are so 90s...

-> Andre Beck    +++ ABP-RIPE +++      IBH IT-Service GmbH, Dresden <-