On Tue, 2010-02-09 at 08:53 -0500, Jeff Gilmore wrote:
> I have attached a trace of a call that went like this:
> 
> 1. Placed call from an outside phone (i.e not attached to my switch).
> 2. The sipx extension which has the called DID as an alias rings immediately.
> 3. I pick up after 1 ring.
> 4. I hear dead air on both phones (and no ringing, or ring tone on either).
> 5. After about 10 seconds, I hear a brief ring tone on the calling phone.
> 6. The audio connects,
> 7. I stay on the line for about 10 seconds.
> 8. I hang up the sipx extension

Note that you have not provided any of the extension numbers, nor
described the expected call behavior of the DID, which makes things
harder for us.

Looking at the trace, it appears to be a normal call.  The number called
is 6078829030.  It gets mapped into sip:[email protected].
sip:1...@... gets mapped into sip:[email protected]:5060,
sip:1...@ev..., and sip:~~vm~...@ev... (with priority 0.1).  The call is
sent to sip:[email protected]:5060.  sip:1...@... has no contacts.

The interesting bit is the INVITE to sip:[email protected]:5060.  It is
sent by TCP at 00:20:53Z, and appears to get an immediate ICMP reject.
So it is resent by UDP within the same second.  The phone responds 100
and 180 within the same second.  The 180 is delivered to the originating
UA promptly.  But the UA (Linksys/SPA2102-5.2.10) responds 200 at
00:21:07Z, which is 14 seconds after ringing starts.

Based on your description, it appears that the UA took about 10 seconds
after you answered the phone to generate the 200.

So it looks like the problem is with the UAs on each end of the call.

Dale


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