Sip Message Authentication Example - AudioCodes Mediant 4000 SBC User Manual

CHAPTER 20 SIP Definitions
To view the registration status of endpoints with a SIP Registrar/Proxy server, see
Viewing Registration
➢
To configure the Proxy and registration parameters:
1. Open the Proxy & Registration page (Setup menu > Signaling & Media tab > SIP
Definitions folder > Proxy & Registration).
2. Configure the parameters as required.
3. Click Apply.
➢
To register or un-register the device to a Proxy/Registrar:
■ Click the Register button to register.
■ Click Un-Register button to un-register.
Instead of registering the entire device, you can register specific entities as listed below by using
the Register button located on the page in which these entities are configured:
■ Trunk Groups - Trunk Group table (see Configuring Trunk Groups)
■ Accounts - Accounts table (see

SIP Message Authentication Example

The device supports basic and digest (MD5) authentication types, according to SIP RFC 3261. 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
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
Status.
Configuring Registration
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Mediant 4000 SBC | User's Manual
Accounts)