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IPSec for IP Telephony

     Is the intent of the IPSEC community that secure IP Telephony 
     applications utilize 3DES in CBC mode for encryption?  Considering the 
     extreme sensitivity that IP Telephony has for latency, CBC mode is not 
     a good choice for a cryptographic mode for that application.  Has a 
     stream-cipher mode of operation for delay-sensitive IPSEC applications 
     been defined somewhere?  
     Frank Costantini