[asterisk-users] blind transfer on hook-flash from SIP phone

[Paul Hayes]

Hi,

I have a SIP phone which does not natively support SIP transfers (REFER 
etc...).  So far all that is possible is to enable blind transfers using 
the t and T arguments in Dial from the # DTMF key.  The phone has an R 
button on it and this can be setup to either send an RFC2833 hook flash 
message (value 16) or a SIP INFO message which you can edit the contents 
of (since there seems to be no standard way of signalling a hook flash 
in SIP INFO).

However, Asterisk ignores the hook flash messages and I can't find 
anyway of getting it to treat the hook flash message in the same way as 
a # being sent.

The only information I can find relates to detecting or sending hook 
flashes on zap channels.

cheers,
Paul.