[Serusers] Proxy Behaviour on a parallel fork
Klaus Darilion
klaus.mailinglists at pernau.at
Thu Sep 29 23:17:36 CEST 2005
jim.pafford at comcast.net wrote:
> In ser 0.9.3 I am seeing the following problem with a parallel forking
> scenario. The SER is sending the final Request ACK to the wrong location
> every time. Is there a way to fix this. See below:
>
> Endpoint (xyz at 1.1.1.1 <mailto:xyz at 1.1.1.1>) sends
> Invite(abc123 at proxy.com <mailto:abc123 at proxy.com>) to the SER.
> SER looks up location and then sends the following three messages:
> TRYING back to (xyz at 1.1.1.1 <mailto:xyz at 1.1.1.1>)
> INVITE to abc123 at 2.2.2.2 <mailto:abc123 at 2.2.2.2>
> INVITE to abc123 at 3.3.3.3 <mailto:abc123 at 3.3.3.3>
>
> This looks good so far.
> SER then gets back ringing from both endpoints and sends along to
> xyz at 1.1.1.1 <mailto:xyz at 1.1.1.1>
>
> abc123 at 3.3.3.3 <mailto:abc123 at 3.3.3.3> answers the call and sends back OK
> SER then sends OK to xyz at 1.1.1.1 <mailto:xyz at 1.1.1.1> - Still good
> SER then sends CANCEL to abc123 at 2.2.2.2 <mailto:abc123 at 2.2.2.2>
> abc123 at 2.2.2.2 <mailto:abc123 at 2.2.2.2> responds with 200 Canceling - so
> far so good.
>
> Now xyz at 1.1.1.1 <mailto:xyz at 1.1.1.1> sends the ACK to (abc123 at proxy.com
> <mailto:abc123 at proxy.com>) - Still looks good.
>
> But now after looking up location for abc123 SER sends the ACK to the
Do you use lookup(location) for ACK? This is not necessary. It should be
handled in loose_route section.
klaus
> wrong endpoint abc123 at 2.2.2.2 <mailto:abc123 at 2.2.2.2>
>
> What am I doing wrong? SER always sends the ACK back to the first
> address in the list as shown by serctl ul show abc123. Is there a way
> to correct this so that SER knows the correct endpoint to relay the ACK
> to? Seems like it should understand which endpoint sent back the OK to
> the original INVITE and then send the ACK to that endpoint and not the
> first one in the list after a location lookup.
>
> thanks,
> Jim
>
>
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