Subject: Re: MGC Failure

From: Brian Rosen <[email-masked]>
Date: Tue, 24 Aug 1999 13:33:12 -0400

> > Does the protocol say anything about this?
>         [[TomT]]
>         Notify is ACKed -- this was an oversight which will
> be corrected in
> the next issue of the protocol document.  The protocol has no explicit
> provision for detection of MGC failure.  The most likely
> scenario is that a
> backup MGC will actually take over by issuing a ServiceChange
> to the MG.
There is no takeover, there is handoff, but not takeover.
MGC failure is detected by lack of ack.

>         I expect lots of comment on this one because it is an
> area which may
> need more work..
Let's not go there.  We need more experience before we invent more
mechanism in this area, I think.

> > 2. The H.GCPMEGACO/H.248 document says the following:
> >
> >
> > Page 62
> > -------
> >
> > If a new Media Gateway Controller is detected, the Media
> Gateway starts
> > transmitting outstanding commands to that new agent.
> Responses to commands
> > are still transmitted to the source address of the command.
This is leftover MGCP stuff, and will be deleted.

> >
> > Page 70
> > -------
> >
> > When the MGC initiates a Handoff, the handover should be
> transparent to
> > Operations on the Media Gateway. Commands in progress continue,
> > transaction replies are sent to the new MGC, ...
This is the behavior we want.