[OpenSIPS-Users] UAC module causing malformed CANCEL

[Bogdan-Andrei Iancu]

Hi Ben,

Thanks for the report - could you please open a bug report on GITHUB 
with the relevant information ? It will be easier for us to track it.

Best regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
OpenSIPS Summit 2019
   https://www.opensips.org/events/Summit-2019Amsterdam/

On 12/05/2018 05:17 PM, Ben Newlin wrote:
>
> Hello,
>
> I have found an issue with using the UAC module to replace the From/To 
> headers. When one of these headers is the last header in a SIP INVITE, 
> the UAC module is injecting an extra line break in subsequent CANCEL 
> requests causing an invalid request. This happens when either of these 
> headers are the last header in the originally received INVITE, but 
> also if they become the last header due to modifications made to the 
> original INVITE, e.g. if the last 2 headers were To followed by 
> P-Asserted-Identity and the script processing calls 
> remove_hf(“P-Asserted-Identity”) thus making the To header last.
>
> I have only seen this happen on a CANCEL request. Other sequential 
> requests like BYE or re-INVITE are not malformed.
>
> A tcpdump capture of the message sequence can be found here: 
> https://pastebin.com/myDVU5Jz. Note the extra whitespace line in the 
> second CANCEL message forwarded from OpenSIPS (203.0.113.3).
>
> Ben Newlin
>
>
>
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