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4.13 Agent Anonymity

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This section follows the product behavior described in endnote <82>.

The following example shows the INVITE a server endpoint sends to establish an anonymous call, excluding common required headers and the SDP part.

INVITE sip:Alice@contoso.com;gruu;opaque=user:epid:qIIWS2j5AVeD_HxnQdxmlwAA SIP/2.0
From: sip:Bob@contoso.com;epid=02020202;tag=02020202
To: sip:Alice@contoso.com;
Call-Id: f0ec9c595c1f412ca6b71318beb599bb
Via: SIP/2.0/TLS 192.0.2.1:27221;branch=z9hG4bKa8d4
Cseq: 4 INVITE
Ms-Call-Info: Rgs.Anonymization
Contact:<sip:server1@contoso.com;gruu;opaque=srvr:HomeServer:VWIdpJWTA1eatgf05sHGswAA>;automata;actor="attendant";text;audio;video;image

In this example, the server endpoint is impersonating Bob. The contact remains the server endpoint GRUU.

The following example show the 200 OK response a server endpoint sends to establish an anonymous call initiated by a user endpoint, excluding common required headers and the SDP part.

SIP/2.0 200 OK
From: sip:Alice@contoso.com;epid=02020202;tag=02020202
To: sip:Helpdesk@contoso.com;epid=01010101;tag=01010101
Call-Id: f0ec9c595c1f412ca6b71318beb599bb
Via: SIP/2.0/TLS 192.0.2.1:27221;branch=z9hG4bKa8d4
Cseq: 4 INVITE
Ms-Call-Info: Rgs.Anonymization
Contact:<sip:server1@contoso.com;gruu;opaque=srvr:HomeServer:VWIdpJWTA1eatgf05sHGswAA>;automata;actor="attendant";text;audio;video;image

The following example show the request a client endpoint (5) can send to request a call on behalf of the Helpdesk and the response from the server (2) endpoint (5), using anonymity and excluding common required headers and the SDP part.

INVITE sip:Helpdesk@contoso.com;gruu;opaque=user:epid:qIIWS2j5AVeD_HxnQdxmlwAA SIP/2.0
From: sip:Alice@contoso.com;epid=02020202;tag=02020202
To: sip:Bob@contoso.com;
Call-Id: f0ec9c595c1f412ca6b71318beb599bb
Via: SIP/2.0/TLS 192.0.2.1:27221;branch=z9hG4bKa8d4
Cseq: 4 INVITE
P-Agent-On-Behalf-Of: sip:Helpdesk@contoso.com
 
SIP/2.0 200 OK
From: sip:Alice@contoso.com;epid=02020202;tag=02020202
To: sip:Bob@contoso.com;epid=01010101;tag=01010101
Call-Id: f0ec9c595c1f412ca6b71318beb599bb
Via: SIP/2.0/TLS 192.0.2.1:27221;branch=z9hG4bKa8d4
Cseq: 4 INVITE
Ms-Call-Info: Rgs.Anonymization
Contact:<sip:server1@contoso.com;gruu;opaque=srvr:HomeServer:VWIdpJWTA1eatgf05sHGswAA>;automata;actor="attendant";text;audio;video;image