[SR-Users] Handling Hold

[Alex Balashov]

On 08/13/2015 03:40 PM, Fred Posner wrote:
>
> On 08/13/2015 03:30 PM, Alex Balashov wrote:
>> I see a dialog established followed by a reinvite. Which frame # do you
>> take to be the "on-hold invite"?
>>
>
> I was taking frame 8 as a new invite. I'll see what I'm doing wrong.

No, it's a reinvite. The distinguishing feature of an in-dialog request 
(aka in-dialog invite aka reinvite) is the presence of a To-tag:

    To: <sip:+1callerid-did@[PSTN-IPADDRESS]:5060>;tag=gK0e4a212a

The Route headers also give it away:

    Route: 
<sip:[PUBLIC-KAMAILIO];lr;r2=on;ftag=gK0e4a212a;vst=AAAAABkJAw0IDQ4PAQF2AXIWFwYXGQEWHQc4OjUwNjA-;did=7.a51>
    Route: 
<sip:127.0.0.8;line=sr-XLSMq0lrx0hrq6lrx0lgX0dzPLkgP9dgTvDWTH2vZH1Se5CmxIuWqyTHF621E-R1E-uaZhRyxCSC-IDEEKR5xhRiZKF5F2SiD2RRKtWDiHD48SKyI.Q1fIwh8sEzemYWeIC*>

These are built from the Record-Routes in the initial INVITE transaction:

    Record-Route: 
<sip:[PUBLIC-KAMAILIO];r2=on;lr;ftag=gK0e4a212a;vst=AAAAABkJAw0IDQ4PAQF2AXIWFwYXGQEWHQc4OjUwNjA-;did=7.a51>
    Record-Route: 
<sip:127.0.0.8;line=sr-XLSMq0lrx0hrq6lrx0lgX0dzPLkgP9dgTvDWTH2vZH1Se5CmxIuWqyTHF621E-R1E-uaZhRyxCSC-IDEEKR5xhRiZKF5F2SiD2RRKtWDiHD48SKyI.Q1fIwh8sEzemYWeIC*>

It's definitely a reinvite.

-- Alex

-- 
Alex Balashov | Principal | Evariste Systems LLC
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