Juha -
The classic answer for this is that the gateway should have a DNS
name with its NAPTR and SRV
records configured to specify exactly TLS. Do you agree that if you
have DNS available, that's good
enough?
I think you're pointing to specifically the case where you don't have
DNS records pointing to UAS,
is that correct?
RjS
On Jun 4, 2007, at 1:05 PM, Juha Heinanen wrote:
Francois Audet writes:
Which hop???
UAC -----> Proxy 1 ------> Proxy 2 ------> UAS
for example, lets say that UAS is pstn gw that needs to be contacted
over tls. proxy 1 makes a decision to use this particular pstn gw,
rewrites r-uri so that it among other things contains transport=tls
parameter, and then forwards the request to proxy 2 that is a "dumb"
proxy whose purpose is to front end the gw.
i don't know another way to do this because sip uri scheme cannot be
upgraded to sips and sips scheme cannot be downgraded to sip.
-- juha
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