Ok, I tried progrssinband=yes and it didn’t change the way asterisk behaves.
I am wondering if it’s possible at all to make this work.
Could it be a problem at the configuration of the line at telco-side?
I re-checked HANGUPCAUSE and got an idea what messages to record bymyself, but then I’d still need the external anouncements for changed numbers
“The number has changed. The new number is 0123456789”
Another thing i found was:
; Allow inband audio (progress) when a call is RELEASEd by the far end of a PRI
I am not sure if that option could do what i want. The problem is, that it isn’t available in our quiet old Asterisk setup from the Debian Stable Repos (1.2.13). I don’t want to setup a new system with the latest Asterisk without being sure, that it would solve my problems, because everything else is working perfectly for us.
Thanks for any help