Can you expand ... I'm hoping to use Asterisk to do SIP to MGCP mediation ... what does it not work?
I don't know the particulars, because I've never used (or even looked at MGCP). All I know is that whenever the issue comes up, people here say that Asterisk does not know how to act as an MGCP Gatekeeper, only as an agent. I presume it would have to act as a gatekeeper to control an MGCP-based media gateway, because those devices are all intended to be controlled by some sort of softswitch.
IMO, there is no such thing as an "MGCP gatekeeper"; try that phrase with Google and it will be obvious. "Gatekeeper" is an H.323 term.
MCGP is a master-slave protocol. The master is referred to as a "Call Agent", a "Media Gateway Controller", or just a "softswitch". This is the role that Asterisk can play. The slave is a "Media Gateway", an "MGCP phone", an "MGCP ATA", or just an "endpoint". Asterisk cannot presently act as a slave.
Of course, any large system may have higher-level elements that handle authorization, accounting, complex routing, queueing, etc., but those topics are beyond the scope of MGCP. Perhaps the term "gatekeeper" was used in that context.
So, I think that Asterisk will provide the functionality that you desire. However, I don't know if SIP<->MGCP calls can presently be completed without Asterisk proxying the media stream, so you may have performance issues. Perhaps someone else can address that.
--Stewart
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