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Re: [Linphone-users] HT-Proxy and Linphone (HTTP-Tunneling)

From: Klaus Darilion
Subject: Re: [Linphone-users] HT-Proxy and Linphone (HTTP-Tunneling)
Date: Wed, 16 Jun 2010 19:11:11 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv: Gecko/20100317 Thunderbird/3.0.4

Am 16.06.2010 15:51, schrieb Mitch Davis:
On Wed, Jun 16, 2010 at 5:41 PM, Sebastian Wagner<address@hidden>  wrote:

I would like to know if there are plans or started implementation for
HTTP-Tunneling in Linphone.

Anyway: HTTP-Tunneling is a quite common (and comfortable) way of
bypassing the firewall

One problem with doing this is that HTTP uses TCP, which is a
"reliable" protocol.  That is, the protocol doesn't pay special
attention to getting packets delivered on time, rather, it focuses on
getting *all* packets delivered, in order.  This isn't a great idea
when one is carrying live voice, because for time-critical
applications like voice, it's better to drop a few packets than to
hold everything up and be 100% reliable.  Most voice and video codecs
are designed with this in mind, and can somewhat conceal some missed

It may be easy to tunnel HTTP, and it may be possible to do live voice
over HTTP, but in general, HTTP is the wrong tool for the job.

In theory you are correct. But enough bandwidth and some application logic can solve the problem - see Skype which can tunnel everything over HTTP(S).

SIP over HTTP tunnel should be rather easy to implement. the client only has to use SIP over TCP/TLS and connect to the http proxy instead of the real target, and then send a CONNECT request before starting with the SIP signaling. Of course there might be issues with SRV/NATPR lookups as those are of course not implemented by normal HTTP proxies.


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