[Asterisk-Users] [OT] Disconnect Tone in US

[Eric "ManxPower" Wieling]

Paul Dugas wrote:
> I have a SPA-3000 that is failing to hanging up pretty often; almost
> every day now.  The weird thing is that an almost identically configured
> (same FW, different HW rev) second unit right next to it isn't having
> the same problem.  Swap the lines and the problem stays with the unit.
> 
> I've been going round and round with Sipura and their latest message
> told me to use a procedure detailed in a Voxilla posting [1] to measure
> the disconnect tone and ensure the configs match.
> 
> This seems totally off base to me but I figure I'd ask.  Anybody care to
> comment?  Do disconnect tones vary wildly in the US?  Do they vary
> between two lines from the same telco switch?

The telcos generally drop battery for a short time (500ms?) when the far 
end hangs up.  After that they usually play a message for s time, then 
play a "howler" tone.  The SIPura should detect the battery drop and 
hang up the line.

Analog FXS ports on PBXs usually do not drop battery.  The usually play 
a congestion tone (fast busy).

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