AudioCodes Mediant 800B User Manual page 304

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The equation to be evaluated is "REGISTER:sip:10.2.2.222".
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The MD5 algorithm is run on this equation and stored for future usage.
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The result is "a9a031cfddcb10d91c8e7b4926086f7e".
6. Final stage:
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A1 result: The nonce from the proxy response is
"11432d6bce58ddf02e3b5e1c77c010d2".
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A2 result: The equation to be evaluated is
"A1:11432d6bce58ddf02e3b5e1c77c010d2:A2".
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The MD5 algorithm is run on this equation. The outcome of the calculation is the
response needed by the device to register with the Proxy.
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The response is "b9c45d0234a5abf5ddf5c704029b38cf".
At this time, a new REGISTER request is issued with the following response:
REGISTER sip:10.2.2.222 SIP/2.0
Via: SIP/2.0/UDP 10.1.1.200
From: <sip: 122@10.1.1.200>;tag=1c23940
To: <sip: 122@10.1.1.200>
Call-ID: 654982194@10.1.1.200
Server: Audiocodes-Sip-Gateway/Mediant 800B Gateway and E-
SBC/v.6.60.010.006
CSeq: 1 REGISTER
Contact: sip:122@10.1.1.200:
Expires:3600
Authorization: Digest, username: 122,
realm="audiocodes.com",
nonce="11432d6bce58ddf02e3b5e1c77c010d2",
uri="10.2.2.222",
response="b9c45d0234a5abf5ddf5c704029b38cf"
7. Upon receiving this request and if accepted by the Proxy, the Proxy returns a 200 OK
response, completing the registration transaction:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.1.1.200
From: <sip: 122@10.1.1.200>;tag=1c23940
To: <sip: 122@10.1.1.200>
Call-ID: 654982194@10.1.1.200
Cseq: 1 REGISTER
Date: Thu, 26 Jul 2012 09:34:42 GMT
Server: Columbia-SIP-Server/1.17
Content-Length: 0
Contact: <sip:122@10.1.1.200>; expires="Thu, 26 Jul 2012
10:34:42 GMT"; action=proxy; q=1.00
Contact: <122@10.1.1.200:>; expires="Tue, 19 Jan 2038 03:14:07
GMT"; action=proxy; q=0.00
Expires: Thu, 26 Jul 2012 10:34:42 GMT
User's Manual
Mediant 800B Gateway and E-SBC
304 Document #: LTRT-10620