[asterisk-users] restricting sip users to a certain useragent

[A J Stiles]

On Tuesday 29 Jun 2010, Tarek Sawah wrote:
> ..... is it possible to
> force the agents (users) to use a certain UserAgent which is the one
> built-in our system?  this way will prevent the agents we are restricting
> them to only be able to dial through the software which is already
> restricted to their seats in the call center.. but someone might sniff
> around .. and get the sip username and password assigned to him and use it
> through Zoiper or any other softphone to make calls .....

If someone is *that* determined, what will stop them from modifying the 
user-agent string in some Open Source softphone?

-- 
AJS