Request not allowed 403

[ruhuru]

I'm installing a 9640 SIP on a IPO 500 R9.1 and I get: Request not allowed 403
on the System Monitor I get:
SIP Tx: UDP 172.16.2.1:5060 -> 172.16.2.116:5060
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 172.16.2.116;branch=xxxx
From: <sip:[email protected]>;tag xxxxx...
Call ID: [email protected]
CSeq: 1 REGISTER
User-Agent: IP Office 9.1.0.0 build 437
Allow: Invite, Ack, Cancel, Options, Bye, Refer,Notify,Info, Subscribe,Register,Publish
WWW-Authenticate: Digest nonce="xxxxxx", realm=ïpoffice" algorithm= MD5
Supported: timer
Server: IP Office 9.1.0.0 build 437
to: <sip:[email protected]>;tag= xxxxxx
Content-length: 0

THANKS!

[markgallagher]

Unless you are using your IP Office as a branch to an Aura network, then 9600 series phones running SIP firmware are not supported on IP Office. You need to load the phone with the 9600 H323 firmware for it to work.

[ruhuru]

Thanks.
How I load the H323 Firmware?