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[qingbaibai <question201484@xxxxxxxxxxxxxxxxxxxxx>]

Question #201484 on rohc changed:
https://answers.launchpad.net/rohc/+question/201484

    Status: Answered => Open

qingbaibai is still having a problem:

hello,
I only test VoIP streams which include only one IP header.  And in my test, the packet is coded as UOR-2-ID and the RND is 0. But it is decoded as UOR-2-RTP and the RND is analysed as 1. I don;t know why the RND changes. Thank you.

> To: sunqing.cztz@xxxxxxx
> From: question201484@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [Question #201484]: In what situation will the rand change when	decompressing
> Date: Tue, 26 Jun 2012 13:31:08 +0000
> 
> Your question #201484 on rohc changed:
> https://answers.launchpad.net/rohc/+question/201484
> 
>     Status: Open => Answered
> 
> Didier Barvaux proposed the following answer:
> Hi qingbaibai,
> 
> The RND flag may change in extension 3, more especially in the IP header
> flags. The packet will be parsed as UOR-2-ID (or UOR-2-RTP), and if it
> contains a RND flag whose value is different from the one stored in
> context, then the packet will be reparsed as UOR-2-RTP (or UOR-2-ID).
> 
> Last week I found that there are some problems in the library related to
> the above algorithm for streams with double IP headers. I have yet to
> analyze the problem and report it on the bugtracker. Did you find a
> problem on that part too?
> 
> Regards,
> Didier
> 
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