[SIPForum-discussion] need help from people who know all the rules by heart

[nitin kapoor]

Hello Michael,



Black hole can be possible in some case(eg: where you are going to put your
call on hold).



Especially on those cases, where first party is sending you OFFER contains
an audio stream, but the answer from the other contains the connection
address 0.0.0.0 and a random port number, which means that first party
cannot send media to second party (the media  stream is "black holed" or
"bh").  In the second exchange, second party changes the connection address,
and the first party can accepts, and a media session is established.


Can you please send the ethereal traces so that we can check.



Thanks,

Nitin Kapoor


2009/4/17 RAJESH KUMAR RAJU <rajeshk.r at samsung.com>

>
>  HI ,
>
> what is Black hole SDP and kindly attach eth trace without this difficult
> to trace
>
>
>
>
> ------- *Original Message* -------
> *Sender* : Michael Trank<mtrank at apexvoice.com>
> *Date* : Apr 17, 2009 11:56 (GMT+09:00)
> *Title* : [SIPForum-discussion] need help from people who know all the
> rules by heart
>
>
> I have a situation where some sessions between a UAC and a UAS look like
> this:
>
> It looks like this:
>
>        UAC                                    UAS
>
>       INVITE         ===>>
>       200 OK    <<===
>       ACK         ===>>
>
> some seconds pass by....
>
>       Re-INVITE   <<====  ( with "BlackHole" SDP )
>       100 Trying   ===>
>       BYE        ===>
>        100 Trying    <===  ( provisional for BYE  )
>         BYE      ===>
>        100 Trying    <===  ( provisional for BYE  )
>        BYE      ===>
>        100 Trying    <===  ( provisional for BYE )
>        BYE      ===>
>        100 Trying    <===  ( provisional for BYE  )
>        BYE      ===>
>        100 Trying    <=== ( provisional for BYE  )
>
>
> and thats it, things kind of get stuck like this. The BYE's stop, but
> the call finished somewhat un-gracefully.
>
> What is supposed to happen  when  a  re-INVITE gets sent in one
> direction and  a BYE gets sent in the other, ignoring the re-INVITE?
>
>
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