Hi,
A proxy will do a lookup only if it is responsible for the domain
in the request uri. Otherwise it will try to resolve the domain in the
request uri using other techniques such as DNS etc . If it finds that the
destination to be forwarded to is another domain proxy or gateway and this
gateway for example could be down and the proxy is aware of this, the
proxy may decide to generate a 502 response.
Again as i said the generation of a 502 response is implementation
dependent .
Regards
Nisha
"Atul Khandelwal" <[EMAIL PROTECTED]>
08/24/04 05:58 PM
To
<[EMAIL PROTECTED]>
cc
"Sip-Implementors" <[EMAIL PROTECTED]>,
<[EMAIL PROTECTED]>
Subject
RE: [Sip-implementors] 502 Bad Gateway
Hi Nisha,
Thanks for the response.
What you said is true.
But does the Proxy first tries to forward the message to the called domain
or does it forwards the message to Location/Redirect server(i.e Query
them)?
Or is it that it simply finds out whether the called domain is present in
the look up table (if implemented in the Proxy) and then respond
accordingly......
Can you tell me the precise procedure?
Regards,
Atul
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 24, 2004 2:55 PM
To: Atul Khandelwal
Cc: Sip-Implementors; [EMAIL PROTECTED]
Subject: Re: [Sip-implementors] (no subject)
Hi,
The generation of 502 response is implementation dependent. 502
is a special case wherein the proxy should know that the next hop that it
is trying to reach is another domain proxy or a gateway. The protocol
does not discuss how to handle such responses. That will again depend on
the implementation.
For example if the proxy implementation has a way to identify
alternate routes/gateways the request should be forwarded to the same.
Regards
Nisha
"Atul Khandelwal" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
08/24/04 11:24 AM
To
"Sip-Implementors" <[EMAIL PROTECTED]>
cc
Subject
[Sip-implementors] (no subject)
Hi all,
Is 502 Bad Gateway response received when the proxy is not in the
position to find out the called party ?
Also in this case does the proxy query the
Redirect and the Location server?
Thanks,
Atul
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