[Blink] Digest user

[Emil Ivov]

Hey folks,

(inline)

На 30.04.10 08:47, Adrian Georgescu написа:
> 
> On Apr 30, 2010, at 1:51 AM, Malcolm Caldwell wrote:
> 
>> Hi Adrian,
>>
>> I now have the log from my work, although the packets are not the same
>> as I say yesterday.  (I wish I had saved them).  However, calls are
>> not working, and this trace shows that:
>>
>> RECEIVED: Packet 19, +0:03:05.878643
>> 2010-04-30 09:01:52.947054: SIP.SERVER.IP.ADDR:5060 -(SIP over UDP)->
>> MY.MAC.IP.ADDR:59181
>> *INVITE sip:fcuzryxa at MY.MAC.IP.ADDR:59181 SIP/2.0
>> *Date: Thu, 29 Apr 2010 23:31:54 GMT
>> Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER,
>> SUBSCRIBE, NOTIFY
>> From:
>> <sip:YYYY at SIP.SERVER.IP.ADDR>;tag=94d7ad56-fdc6-40a9-bd8e-772b8995b8b6-47099214
>> Allow-Events: presence
>> Supported: timer,resource-priority,replaces
>> Min-SE:  1800
>> Remote-Party-ID:
>> <sip:YYYY at 138.80.6.4;x-cisco-callback-number=YYYY>;party=calling;screen=yes;privacy=off
>> Content-Length: 0
>> User-Agent: Cisco-CUCM7.0
>> To: <sip:XXXX at MY.MAC.IP.ADDR>
>> Contact: <sip:YYYY at SIP.SERVER.IP.ADDR:5060>;video;audio
>> Expires: 180
>> Call-ID: 63b1d680-bda116ea-b7-406508a at SIP.SERVER.IP.ADDR
>> Via: SIP/2.0/UDP SIP.SERVER.IP.ADDR:5060;branch=z9hG4bKc721379491
>> CSeq: 101 INVITE
>> Send-Info: conference
>> Max-Forwards: 70
>> Alert-Info: <file://Bellcore-dr1/>
> 
> There is no SDP with any type of supported media in this Invite.
> 
> You are using Blink against a non-standard compliant corporate PBX
> solution that works only with approved phone devices by Cisco.
> 
> What do you want to see happening except rejecting it?

It's probably worth noting that 3261 does authorize empty INVITEs. In
such cases you simply need to send an offer in the OK, and get the
answer in the ACK.

From 3261, 13.2.1:

         The initial offer MUST be in either an INVITE or, if not there,
         in the first reliable non-failure message from the UAS back to
         the UAC.  In this specification, that is the final 2xx
         response.

and then:

         If the initial offer is in the first reliable non-failure
         message from the UAS back to UAC, the answer MUST be in the
         acknowledgement for that message (in this specification, ACK
         for a 2xx response).

Here's the whole thing (starting at the bottom):
http://tools.ietf.org/html/rfc3261#page-79

Cheers,
Emil


> 
> Adrian
> 
> 
> 
> _______________________________________________
> Blink mailing list
> Blink at lists.ag-projects.com
> http://lists.ag-projects.com/mailman/listinfo/blink

-- 
Emil Ivov, Ph.D.                               67000 Strasbourg,
Project Lead                                   France
SIP Communicator
emcho at sip-communicator.org                     PHONE: +33.1.77.62.43.30
http://sip-communicator.org                    FAX:   +33.1.77.62.47.31