Re: How to remove Reason HF from branched CANCEL?

Hi Henning

> did you played already with 
> 
> - local_cancel_reason
> - e2e_cancel_reason
> 
> from the tm module?

No, but thank you for hinting towards the possibilities and
documentation on how TM handles cancel.

So documenting my findings for the mail archive :-)

Cancel is not routed, but always generated locally (as a result of an
answered branch or of an inbound CANCEL). In the case of e2e
cancel the Reason header is copied from the inbound cancel to the
generated outbound branch CANCEL. This is why remove_hf() does not work.

I would prefer not to disable copying the reason
e2e_cancel_reason => 0

But rather only disable it, when the wrong reason, causing missed calls
not to be logged at the destination, sent by iPhones, is encountered.

t_set_no_e2e_cancel_reason(1) would require to be set at the start of
the transaction (INVITE) when the bogus reason is not yet known.

I reverted to call msg_apply_changes() after removing the header in the
inbound CANCEL matching the iPhone text and cause. This works.

I just hope calling msg_apply_changes() on something as simple as
CANCEL will not break anything else. I guess not, as only the Reason
header is copied from the original cancel request.

Mit freundlichen Grüssen

-Benoît Panizzon-
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