Sip Message Authentication Example - AudioCodes MP-11x User Manual

User's Manual

FXS/FXO endpoints - Endpoint Phone Number Table page (see Configuring Endpoint
Phone Numbers on page 235)

Accounts - Account table (see 'Configuring Account Table' on page 213)
Click the Proxy Set Table
groups of proxy addresses. Alternatively, you can open this page from the Proxy Sets
Table page item (see 'Configuring Proxy Sets Table' on page
page).

18.3.1 SIP Message Authentication Example

The device supports basic and digest (MD5) authentication types, according to SIP RFC
3261 standard. A proxy server might require authentication before forwarding an INVITE
message. A Registrar/Proxy server may also require authentication for client registration. A
proxy replies to an unauthenticated INVITE with a 407 Proxy Authorization Required
response, containing a Proxy-Authenticate header with the form of the challenge. After
sending an ACK for the 407, the user agent can then re-send the INVITE with a Proxy-
Authorization header containing the credentials.
User agents, Redirect or Registrar servers typically use the SIP 401 Unauthorized
response to challenge authentication containing a WWW-Authenticate header, and expect
the re-INVITE to contain an Authorization header.
The following example shows the Digest Authentication procedure, including computation
of user agent credentials:
1. The REGISTER request is sent to a Registrar/Proxy server for registration:
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=1c17940
To: <sip: 122@10.1.1.200>
Call-ID: 634293194@10.1.1.200
User-Agent: Sip-Gateway/MediaPack/v.6.60.010.006
CSeq: 1 REGISTER
Contact: sip:122@10.1.1.200:
Expires:3600
2. Upon receipt of this request, the Registrar/Proxy returns a 401 Unauthorized
response:
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 10.2.1.200
From: <sip:122@10.2.2.222 >;tag=1c17940
To: <sip:122@10.2.2.222 >
Call-ID: 634293194@10.1.1.200
Cseq: 1 REGISTER
Date: Mon, 30 Jul 2012 15:33:54 GMT
Server: Columbia-SIP-Server/1.17
Content-Length: 0
WWW-Authenticate: Digest realm="audiocodes.com",
nonce="11432d6bce58ddf02e3b5e1c77c010d2",
stale=FALSE,
algorithm=MD5
3. According to the sub-header present in the WWW-Authenticate header, the correct
REGISTER request is created.
4. Since the algorithm is MD5:
•
The username is equal to the endpoint phone number "122".
•
The realm return by the proxy is "audiocodes.com".
•
The password from the ini file is "AudioCodes".
Version 6.6
button to Open the Proxy Sets Table page to configure
217
18. SIP Definitions
208 for a description of this
MP-11x & MP-124