[Blink] Digest user

Malcolm Caldwell malcolm.caldwell at cdu.edu.au
Fri Apr 30 10:11:36 CEST 2010


Hi Adrian,

The Ip address issue is not required to get BLINK working with this
particular PBX, it was just needed if I wanted to do this over a VPN.  Now,
even if you don¹t want to support this, again it does not affect the ability
to register against this PBX.

I don¹t agree that corporate PBX solutions always require custom SIP device
implementations.  The vendors are actively trying to support standard SIP
clients.

The issue here is BLINK not handling the case where there is no sdp in an
invite, which by quick googling seems to be called a delayed media-media
INVITE.

As I see it, I have one issue stopping this working, not more and more
problems each day.


From: Adrian Georgescu <ag at ag-projects.com>
Reply-To: <blink at lists.ag-projects.com>
Date: Fri, 30 Apr 2010 09:15:32 +0200
To: <blink at lists.ag-projects.com>
Subject: Re: [Blink] Digest user

Malcolm,

Blink was designed to work against IETF based SIP implementations.

Related to the setup of the fixed IP address question, people who do need
such thing they also need many other things as well in practice. It is the
pandora box of interoperability problems when you try to use a standards
based solution against a custom setup environment with private VPN, custom
network settings, and proprietary PBX extensions. What you solve in one site
cannot be used in another where you bump into another type of problem.

As you see, the number of problems you are reporting increase by the day and
the reasons are simply in your custom environment. For such environment your
vendor must deliver something fine tuned for that environment.

Blink is meant to be used only on public internet against a public SIP
server and not private corporate environments with custom PBX solutions,
these solutions always need custom SIP device implementations.

Adrian


On Apr 30, 2010, at 8:52 AM, Malcolm Caldwell wrote:

>  Hi Adrian,
>  
>  CISCO do claim to support third party SIP clients, and I have registered
> softphones against it in the past.
>  
>  I don¹t know why in this case there is no SDP, and I will look into this
> further.
>  
>  
>  
>  
> 
> From: Adrian Georgescu <ag at ag-projects.com>
>  Reply-To: <blink at lists.ag-projects.com>
>  Date: Fri, 30 Apr 2010 08:47:57 +0200
>  To: <blink at lists.ag-projects.com>
>  Subject: Re: [Blink] Digest user
>  
>  
>  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-772b8995b8b6-470992
>> 14
>>   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;p
>> rivacy=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?
>  
>  Adrian
>  
>  
>  
> 
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