[SIPForum-discussion] Query about 407 proxy authentication Required in SIP response

[Vijay Mishra]

Hi Durgesh,

In the SIP RFC 3665 it is given that In order to authenticate Register 401
response is send
and to authenticate Invite 407 response is sent.
http://tools.ietf.org/html/rfc3665

However there is no restriction that proxy cannot sent 407 response for
register message.
The Service-Provider/SIP Proxy Server MAY issue additional 401 Unauthorized
or 407 Proxy Authentication Required responses to REGISTER requests, if the
digest challenge response of the SIP-PBX in its REGISTER request is stale
or invalid

Thanks
V


On Mon, Sep 8, 2014 at 11:38 AM, Durgesh kumar singh <durgeshk1990 at gmail.com
> wrote:

> Hello,
>
>
> I have been reading about SIP register flow and most of the place i found
> that whenever any SIP client try to Register then server response with 401
> unauthorized and then http-digest authentication field added in our next
> Register message headers by which our client get register successfully.
>
> In our project when our SIP client try to register then it first passes
> with a *proxy server* then to *IntraSwitch SIP server.*
>
> In our case Registration flow is look like this.
>
>
> SIP Client                                         SIP Server
>
>     REGISTER with no authentication
> A --------------------------------------------->
>
>     407 Proxy Authentication required
> A <--------------------------------------------
>
>      REGISTER with Authentication
> A --------------------------------------------->
>
>                200 OK 1 binding
> A <--------------------------------------------
>
> So here my question is that is *407 proxy Authentication required *SIP
> response is correct response for SIP registration or it should be *401
> Unauthorized ?*
>
> Please clear my concept.
>
> Regards,
> Durgesh Kumar Singh
>
>
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