Hi James,

it is a know issue that most of UAC do not properly implement 3xx for REGISTER requests... Talk to pjsip guys, they are really good and fast in fixing their stack.

About other solutions....complicated ones...If P1 receives the REGISTERs it needs to deal with the NAT issues and act as a mid registering for P2, the real register server. Like UAC registers via NAT to P1 and P1 registers to P2. You can do this by playing with the contact when forwarding the REGISTER from P1 to P2.

Regards,
Bogdan

James Lamanna wrote:
Hi,
I'm trying to redirect a REGISTER request to a different proxy, mostly
for load balancing purposes.
The UAC is behind NAT, so in order to properly communicate directly
with the next proxy, the UAC must send a new REGISTER request to the
new proxy.
I've tried sending back a 302 Moved Temporarily or 305 Use Proxy
response, but the UAC I'm using (SJPhone) doesn't seem to respond
favorably to either.

Is there another approach I should take?

Thanks.

-- James

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Bogdan-Andrei Iancu
OpenSIPS Event - expo, conf, social, bootcamp
2 - 4 February 2011, ITExpo, Miami,  USA
OpenSIPS solutions and "know-how"


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