Re: [rtcweb] JSEP: Why always offer actpass?

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 04 December 2014 14:08 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: =?utf-8?B?U3RlZmFuIEjDpWthbnNzb24gTEs=?= <stefan.lk.hakansson@ericsson.com>, Justin Uberti <juberti@google.com>
Thread-Topic: [rtcweb] JSEP: Why always offer actpass?
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Date: Thu, 4 Dec 2014 14:08:03 +0000
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Subject: Re: [rtcweb] JSEP: Why always offer actpass?
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Hi,

>> What about the following text:
>>
>> 8.3.2.  TLS Role Determination
>>
>>     If the m- line proto field value is 'SCTP/DTLS' or 'DTLS/SCTP', 
>>     the SDP setup attribute [RFC4145] is used to determine the 'active/
>>     passive' status of the offerer and answerer.  The 'active/passive'
>>     status will be used to determine the TLS roles, following the
>>     procedures in [RFC4572] (the 'active' endpoint will take the TLS 
>>     client role).
>>
>>     Once a DTLS connection has been established, if the 'active/passive'
>>     status of the endpoints change during a session, a new DTLS
>>     connection MUST be established.  Therefore, endpoints SHOULD NOT
>>     change the ‘active/passive’ status in subsequent offers and answers,
>
> Did not the discussion (for rtcweb) conclude that subsequent offers should offer actpass, but that subsequent answers must say the same as the previous answer?

In the Offer/Answer section, I can define more details regarding the values (actpass etc) to use.

BUT, the question is whether we want to allow the endpoints to trigger a new DTLS connection by changing the active/passive status or not. The text above says SHOULD NOT change the active/passive status.

Regards,

Christer