[cisco-voip] Phone Proxy?

[d4rk f1br]

I have seen phones using a 'phone proxy' before and I have seen others
reference it here and there.  But one thing I am not certain of is whether
phone proxy is something specific from Cisco, or is more of a generic term
if you will that applies to a function?  From what I am seeing via the
oracle that is google, it seems that phone proxy is or was both a cisco
product as well as a general term.  But most references which use it as a
term seem to be centered around SIP and asterisk, which is some what
understandable.

I did see that Cisco has/had a Cisco Unified PhoneProxy 1.0 but that it is
going EoS and EoL with the recommendation to migrate to ASA 5500 8.0.4 and
later.

I am looking to leverage a phone proxy for testing a couple of things, and
it just so happens we do have a ASA5520 so this may be a viable option for
me and simply the best and quickest way for me to go.

However I like to hear from others of course.  Any other products that serve
this function, good or bad.  Any best practices or personal thoughts on the
subject would be appreciated.
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