[VoIP] Mediatrix APAs

[David Josephson]

Steph Kerman wrote:
> More careful reading of the manual states there are H.323, SIP and MGCP 
> versions based on firmware resident in non-volatile but updatable 
> memory.  Not sure whether or not that changes anything you said.
>   
Yes, it is common to be able to reload an EEPROM with a different 
revision for different protocols. For instance I have some very nice 
Siemens desk phones that can be flashed to be SIP or MGCP. It does not 
change anything I said -- things that we take for granted, like being 
able to support STUN (i. e. operate behind NAT) are often missing, and 
the protocol implementations are often incomplete. My Siemens phones 
work great -- so long as they are on the same physical network with the 
switch. Oh, and except that they go to sleep and require a power cycle 
to start functioning again, after a day or three. "Oh, we fixed that in 
the next revision of the board and pulled all those from the market."

Unless you have a need to share the pain of embedded systems development 
with some programmers who were just learning how to write microprocessor 
code, I'd leave them all alone (and I have a nice box of them that are 
being left alone).

--
David