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List:       sip-implementors
Subject:    Re: [Sip-implementors] 305 Use Proxy for load balance/redirect
From:       Paul Kyzivat <pkyzivat () cisco ! com>
Date:       2005-06-30 22:44:40
Message-ID: 42C475D8.4030306 () cisco ! com
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Chiuan,

The handling of 305 is very incompletely specified in 3261, to the point 
that interoperable implementations are very improbable. It interacts 
poorly with the various ways that UACs handle default outbound proxies. 
It also interacts poorly with Routes established via Record-Route or 
Service-Route.

Pending clarification on how it should work, you would probably be best 
off not using it.

	Paul

Guo-Wei Chiuan wrote:
> Hi All,
> 
> In RFC3261, it is mentioned that proxy server can send "305 Use Proxy"
> response back to SIP phone. And, SIP phone needs to send INVITE to the
> uri specified in Contact field of "305 Use Proxy" response.
> 
> However, I tried several SIP phones, only one SIP phone does it
> perfectly. It does send INVITE to another SIP proxy specified in
> Contact field of "305 SIP Proxy". Other SIP phones do something wierd.
> For instance, it does change To: field to be uri specified in Contact:
> field but it still keeps sending INVITE to original SIP proxy. (Only
> To: field is changed but destination IP is not changed)
> 
> I am wondering if "305 Use Proxy" supported by most SIP phone vendors
> currently? I would like to redirect INVITE request from one SIP proxy
> to another SIP proxy by this manner. But, it requires that most SIP
> phone vendors support "305 Use Proxy".
> 
> Or, does anybody know other better solutions of doing
> redirect/load-balance? 
> 
> 
> Regards,
> Chiuan
> 
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