> -----Original Message-----
> From: [email protected] [mailto:sip-
> [email protected]] On Behalf Of Charles Shen
> Sent: Thursday, 25 February 2010 11:04 PM
>

> Does anyone have a good idea about how widely SIP-over-TCP and SIP-
> over-TLS
> is used, compared to SIP-over-UDP, in the real world?
> 

(oops, meant this for the list)

When I implemented SIP over TLS and asked my users (I run a SIP aggregator
service with over 1000 different SIP providers being used) if any knew of a
SIP provider that supported sips and I didn't get a single response.

I found one eventually, snom.com, but I think it's fairly safe bet to say
there are not too many public SIP services that support TLS, TCP support is
also fairly low, at a guess maybe 10 or 20%. I've never come across one that
doesn't support UDP. 

One reason TLS and TCP are not as popular on high volume public services is
the connections take significantly more resources to maintain compared to
UDP. 

Aaron



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