[asterisk-dev] [Code Review] Properly route responses according to the Via headers in the request

Olle E. Johansson oej at edvina.net
Thu Dec 23 08:06:44 UTC 2010

22 dec 2010 kl. 20.51 skrev Matthew Nicholson:

> On Wed, 2010-12-22 at 20:35 +0100, Alex Hermann wrote:
>> On Wednesday 22 December 2010, Matthew Nicholson wrote:
>>> This patch makes asterisk respect the Via headers in a request when
>>> responding to the request. Without this patch, the request is always
>>> routed back to the address the initial request was received from (unless
>>> nat=yes).  This can cause problems if the initial request comes through
>>> a proxy and additional requests (such as INFO dtmf tones) come from a
>>> different proxy.
>> New version looks much better. One question remains though. You set the port 
>> to the port in the Via, but if rport is present, it should be set to the 
>> port from which the request originated. I tried to find other code in 
>> chan_sip which overrides the port in case of rport, but couldn't find it. 
>> Maybe rport handling should be included in your process_via function.
> This can probably be supported simply by not modifying the port when
> p->recv is copied.  I'll update the patch.

If we change anything in response handling we should fix it right and just send
to the sender's IP address and port. Always.

It's very simple. Asterisk do not have to parse the via header at all.

That way you can close multiple bug reports in the tracker.


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