RE: [MMUSIC] RTSP timeout issue

["Jaehwan Kim" <jaehwan at vidiator.com>]

I read the RFC2326 clause again. You are right.
---
9 Connections

   RTSP requests can be transmitted in several different ways:

     * persistent transport connections used for several
       request-response transactions;
     * one connection per request/response transaction;
     * connectionless mode.

   The type of transport connection is defined by the RTSP URI (Section
   3.2). For the scheme "rtsp", a persistent connection is assumed,
   while the scheme "rtspu" calls for RTSP requests to be sent without
   setting up a connection.

   Unlike HTTP, RTSP allows the media server to send requests to the
   media client. However, this is only supported for persistent
   connections, as the media server otherwise has no reliable way of
   reaching the client. Also, this is the only way that requests from
   media server to client are likely to traverse firewalls.
---

But in case of connectionless mode, if client doesn't disconnect the given TCP session because of connectivity loss, streaming server can not but waiting until the end of RTSP session timeout(default 60 second); and this value could be configurable at SETUP time; default would be much shorter than TCP's.

Frankly speaking, I am not sure how effectively the connectionless mode could be used, given many actual networks which is complicated with Firewall, NAT, and L4.

Cheers,
Jaehwan

-----Original Message-----
From: Rémi Denis-Courmont [mailto:remi.denis-courmont at nokia.com] 
Sent: Tuesday, September 11, 2007 5:32 PM
To: Jaehwan Kim
Cc: Magnus Westerlund; mmusic at ietf.org
Subject: Re: [MMUSIC] RTSP timeout issue

Le Tuesday 11 September 2007 09:57:20 ext Jaehwan Kim, vous avez écrit :
> As long as session is not expired, I think it is possible.
> If not, the concept of RTSP protocol sending method from server to client
> would be wrongly designed.

And how is the server supposed to send a request to a client that is not
presently connected to it? That's non-sense to me.

-- 
Rémi Denis-Courmont

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