[SR-Users] Record-Route Header Question

[Andres]

On 1/17/17 2:22 PM, Daniel-Constantin Mierla wrote:
>
> Hello,
>
> indeed, the Record-Route address must be local to the server adding 
> it, asking to retrieve the subsequent requests within the same dialog.
>
> Adding the address in Record-Route of other node in the network 
> doesn't make much sense, especially when there is no relation between 
> them.
>
> I have seen SIP stacks adding Route header with the IP of the outbound 
> proxy for initial requests, which is also disputable in terms of how 
> valid it is, but at least is for the current request sent anyhow to 
> that hope, not requesting a node to send traffic to another node.
>
> Likely a bug or misconfiguration in the SBC.
>
Definitely looks like it.  Thanks for taking a look Daniel!

> Cheers,
> Daniel
>
>
> On 17/01/2017 19:40, Andres wrote:
>> Hi,
>>
>> I am troubleshooting some strange call setup problems using an 
>> Edgewater Networks SBC.  A couple of Polycom phones sit behind the 
>> SBC and they connect to a SIP Server in the cloud.  The SBC is in 
>> passthrough mode.
>>
>> What I see that I am not sure about is:
>> INVITE from SIP Server to SBC IP (no Record-Route header...so far no 
>> surprise here)
>> INVITE from SBC to Phone (Record-Route header inserted by SBC but 
>> with the IP of the SIP Server)
>>
>> I do not think the SBC is supposed to add a Record-Route header with 
>> the IP of the remote SIP Server.  I think It should only be allowed 
>> to add Record-Route headers with its own IP.  Does that sound right?
>>
>> The RFC lists the usage as:
>>
>> "20.30 Record-Route
>>
>>    The Record-Route header field is inserted by proxies in a request to
>>    force future requests in the dialog to be routed through the proxy."
>>
>> It says nothing about being able to arbitrarily force future requests 
>> to go through a remote IP.
>>
>> Please advise.
>>
>> Thanks,
>> -- 
>> Technical Support
>>
>>
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>
> -- 
> Daniel-Constantin Mierla
> www.twitter.com/miconda  --www.linkedin.com/in/miconda
> Kamailio World Conference - May 8-10, 2017 -www.kamailioworld.com


-- 
Technical Support

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