[Asterisk-Users] Caller Hears Ring During Attended Transfer?

[Eric Wieling aka ManxPower]

Daryll Strauss wrote:
> I'm running Asterisk 1.0.7 and SPA-3000 Firmware 2.0.13g. 
> 
> A call comes in to my asterisk box via SIP (the Sipura isn't involved)
> and I answer it using an analog phone on the Sipura. I then decide to
> forward it to another phone. I flash the line, dial the new extension,
> and flash again. At this point I and the caller hear the destination
> phone ring. If I then hang up, the caller stops hearing the ring.
> Eventually the voicemail picks up and the caller hears the
> announcement and everything works as normal. It's just rather
> disconcerting for the caller to not hear anything.
> 
> Is this an Asterisk bug, Sipura bug, or operator (me) error?

This is a known (by at least some people) problem.  I don't know of a 
fix or a bug number.