[Users] two phones ringing

[Daniel-Constantin Mierla]

Hello,

seems that the Linksys phone is quite slow in creating the dialog. The 
CANCEL arrives before it has processed the INVITE, and it does not match 
any ongoing dialog. It is not much to be done. OpenSER cannot do much in 
this respect. The proxy is forced to send CANCEL as soon as one branch 
is answered.

By the way, when you answer very quickly, did the other phone ring at 
least once before?

Cheers,
Daniel


On 08/10/06 01:51, Mark Kent wrote:
> I've got two Linksys phones (one spa3000, one spa942)
> and registered markkent at ... from both on the openser1.0.1 box.
>
> >From a third device I call markkent at ... and both ring.  If I take my
> time answering one phone then everything works as expected.  
> The CANCEL gets sent to the second phone and that phone says OK and
> maybe I get one spurious ring but it stops.
>
> I noticed that if I answer one phone really quickly then the other
> phone will keep on ringing.  So, I looked at the traffic and this is
> what happens:
>
>   The players are ORIGINATOR, OPENSER, ANSWEREDPHONE
>   and IGNOREDPHONE
>
>   ORIGINATOR sends the INVITE to OPENSER where it
>   gets branched out to both ANSWEREDPHONE and IGNOREDPHONE
>
>   Both phones send back "100 Trying"
>
>   ANSWEREDPHONE sends "180 Ringing" and  OPENSER relays that
>   to ORIGINATOR
>
>   ANSWEREDPHONE sends "200 OK" when I answer, and OPENSER relays that
>   to ORIGINATOR
>
>   OPENSER sends "CANCEL sip:markkent at IGNOREDPHONE-IP:5062" 
>   to IGNOREDPHONE
>
>   about 0.6 seconds later OPENSER repeats the CANCEL
>
>   IGNOREDPHONE sends back to OPENSER
>   481 Call Leg/Transaction Does Not Exist
>   and does it twice, perhaps once for each CANCEL
>
>   Then IGNOREDPHONE sends back "180 Ringing"
>
>   IGNOREDPHONE rings, a lot, but does not send back "180 Ringing" messages
>
>   There are a lot of "200 OK" messages exchanged between the
>   IGNOREDPHONE and the OPENSER box.
>
> The IGNOREDPHONE took 5 seconds to send back the first "180 Ringing",
> these phones are side by side, although IGNOREDPHONE (the 942) is
> NAT'ed and ANSWEREDPHONE is not.  
>
> The ngrep output is here:  http://a.mainstreet.net/double-ring.txt
>
> What I would like to know is whether this is something I can and/or
> should handle in the openser configuration?  If so, how?
>
> Thanks,
> -mark
>
>
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