[*] [on-asterisk] 3CX and non Asterisk PBX users.

[Ve4drk]

Tunneling would be easier over tcp :-)



On Dec 29, 2010, at 12:55 PM, John Lange <john at johnlange.ca> wrote:

> Sorry to revive a stale thread but I've been doing some work recently
> with the Cisco 9971 phone and interestingly this phone is TCP only for
> both SIP and RTP.
> 
> Since Microsoft and Cisco are both doing VOIP TCP I'm curious if there
> is actually a good reason for this or if it's just a case of the blind
> leading the blind?
> 
> As I said previously in this thread, SIP TCP _might_ make some sense
> as long as you stripped the state tracking out of the SIP protocol
> (which means it wouldn't actually be SIP anymore) but RTP over TCP?
> Madness!
> 
> I can think of only two reasons for this:
> 
> a) Microsoft doesn't know jack about SIP/RTP so they wrote it using
> TCP because they didn't know any better & Cisco wanted to be
> compatible with Microsoft.
> 
> b) Cisco firewalls aren't good at reliably tracking UDP state so they
> decided to get around the problem by using TCP.
> 
> If there is actually a good technical reason for voip over TCP I'd
> love to hear it.
> 
> -- 
> John Lange
> www.johnlange.ca
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