Thank you, Castillo.
At 3.2 in RFC3665, F2 407 is below:
F2 407 Proxy Authorization Required Proxy 1 -> Alice
SIP/2.0 407 Proxy Authorization Required
Via: SIP/2.0/TCP client.atlanta.example.com:5060;branch=z9hG4bK74b43
;received=192.0.2.101
From: Alice <sip:[email protected]>;tag=9fxced76sl
To: Bob <sip:[email protected]>;tag=3flal12sf
Call-ID: [email protected]
CSeq: 1 INVITE
Proxy-Authenticate: Digest realm="atlanta.example.com", qop="auth",
nonce="f84f1cec41e6cbe5aea9c8e88d359",
opaque="", stale=FALSE, algorithm=MD5
Content-Length: 0
In the above, there is no "Contact" header .
So I think Alice can NOT know even the full host name of Proxy1
(ss1.atlanta.example.com).
But Alice(UAC) can resend INVITE to the originator(Proxy1)
at F4 INVITE.
Why can Alice(UAC) do so?
2010/2/10 Iñaki Baz Castillo <[email protected]>:
> El Miércoles, 10 de Febrero de 2010, Couret Tabt escribió:
>> Dear folks,
>>
>> At F2 in the following flow,
>> why alice recognize who sent 407?
>> In F2 407, there is NOT the address of Proxy1.
>> (The following flow is from 3.2. in RFC3665.)
>
>
> It's not possible to know which is the originator of 401/407. That is just
> possible for replies including "Contact" header (200 for INVITE and 1XX with
> 100rel).
>
> But theorically the UAC should matter it. It just must inspect the "realm"
> field and build a credentials based on such realm.
>
>
> --
> Iñaki Baz Castillo <[email protected]>
>
FYI:
3.2. Session Establishment Through Two Proxies
(in RFC3665)
Alice Proxy 1 Proxy 2 Bob
| | | |
| INVITE F1 | | |
|--------------->| | |
| 407 F2 | | |
|<---------------| | |
| ACK F3 | | |
|--------------->| | |
| INVITE F4 | | |
|--------------->| INVITE F5 | |
| 100 F6 |--------------->| INVITE F7 |
|<---------------| 100 F8 |--------------->|
| |<---------------| |
| | | 180 F9 |
| | 180 F10 |<---------------|
| 180 F11 |<---------------| |
|<---------------| | 200 F12 |
| | 200 F13 |<---------------|
| 200 F14 |<---------------| |
|<---------------| | |
| ACK F15 | | |
|--------------->| ACK F16 | |
| |--------------->| ACK F17 |
| | |--------------->|
| Both Way RTP Media |
|<================================================>|
| | | BYE F18 |
| | BYE F19 |<---------------|
| BYE F20 |<---------------| |
|<---------------| | |
| 200 F21 | | |
|--------------->| 200 F22 | |
| |--------------->| 200 F23 |
| | |--------------->|
| | | |
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