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IPSec IP Telephony:End to End or Segment


I've a question which I hope the experts on 
this list can answer/give their opinion.

With respect to IP Telephony, should security be
end-to-end or does it make sense to have it on 
just one segment, eg between two IP Telephony Gateways.

Phone--PSTN--IPGW--IP Network--IPGW--PSTN-Phone

If security is only implemented between the Gateways
is the security risk unacceptable ??

If the phones were Internet-Phones, security could be 
implemented end-to-end using IPSec, but what happens if
one end is an Internet Phone and one end is a normal PSTN Phone ?

Anthony Walwyn                      Title: Senior Systems Engineer
ECI Telecom, UK DCME Development,   Voice: +44(0)1256 388065
ISIS House, Reading Road, Chineham  Fax  : +44(0)1256 388142
Basingstoke, Hampshire UK RG24 8TW  Email: anthony.walwyn@telematics.com