[VoiceOps] Asterisk 1.6.2.20 deregistration bug with NAT keep-alive

[Carlos Alvarez]

We installed an update last night, and found that half our customers would
lose registration after about a minute.  Packet capture shows that the
phone sends the keep-alive (an options packet), gets back a SIP 481 no
subscription, then immediately deregisters.  Turning off keep-alive fixes
the problem.

No contact with Digium yet, figured I'd ask if anyone else has seen it, and
also warn everyone.

-- 
Carlos Alvarez
TelEvolve
602-889-3003
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