Re: [bfcpbis] rfc4583bis TLS SDP example - Re: More comments on RFC 4582

"Charles Eckel (eckelcu)" <eckelcu@cisco.com> Tue, 05 June 2012 17:19 UTC

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Date: Tue, 05 Jun 2012 10:19:14 -0700
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Thread-Topic: [bfcpbis] rfc4583bis TLS SDP example - Re: More comments on RFC 4582
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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: "Tom Kristensen (tomkrist)" <tomkrist@cisco.com>, "Chelliah Sivachelvan (chelliah)" <chelliah@cisco.com>
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Cc: Lorenzo Miniero <lorenzo@meetecho.com>, bfcpbis@ietf.org, Tom Kristensen <2mkristensen@gmail.com>, Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>
Subject: Re: [bfcpbis] rfc4583bis TLS SDP example - Re: More comments on RFC 4582
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I agree, however, perhaps it would be useful to add a second example in
which an endpoint initiates the offer and uses DTLS; e.g.:

Offer from client:

   m=application 50000 UDP/DTLS/BFCP *
   a=setup:actpass
   a=fingerprint:SHA-1 \
        4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB
   a=floorctrl:c-only, s-only
   a=confid:4321
   a=userid:1234	
   a=floorid:1 mstrm:10
   a=floorid:2 mstrm:11
   m=audio 50002 RTP/AVP 0
   a=label:10
   m=video 50004 RTP/AVP 31
   a=label:11

The following is the answer returned by the server.

   m=application 9 UDP/DTLS/BFCP *
   a=setup:active
   a=fingerprint:SHA-1 \
        3D:B4:7B:E3:CC:FC:0D:1B:5D:31:33:9E:48:9B:67:FE:68:40:E8:21
   a=floorctrl:s-only
   a=confid:4321
   a=userid:1234	
   a=floorid:1 mstrm:10
   a=floorid:2 mstrm:11
   m=audio 55000 RTP/AVP 0
   m=video 55002 RTP/AVP 31

Cheers,
Charles

> -----Original Message-----
> From: bfcpbis-bounces@ietf.org [mailto:bfcpbis-bounces@ietf.org] On
> Behalf Of Tom Kristensen (tomkrist)
> Sent: Monday, June 04, 2012 10:54 PM
> To: Chelliah Sivachelvan (chelliah)
> Cc: Lorenzo Miniero; bfcpbis@ietf.org; Tom Kristensen; Gonzalo
> Camarillo
> Subject: [bfcpbis] rfc4583bis TLS SDP example - Re: More comments on
> RFC 4582
> 
> On 06/04/2012 04:22 PM, Chelliah Sivachelvan (chelliah) wrote:
> > Tom,
> >
> > A minor comment on the SDP example in section 9. In the context of
> DTLS,
> > the setup a line must be "actpass" in the offer. See excerpts from
> RFC
> > 5763:
> >
> >       [ The endpoint that is the offerer MUST use the setup
attribute
> >        value of setup:actpass and be prepared to receive a
> client_hello
> >        before it receives the answer.]
> >
> Yes, this is true for DTLS usage (UDP/TLS/BFCP). However, the example
> is
> the original example from RFC 4582 related to TLS (TCP/TLS/BFCP). So I
> believe the example in rfc4583bis is correct!
> 
> -- Tom
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