Media Gateway Control in Vocal

Hi Folks,

I'm kind of confused between all these different media gateway control
protocols.

GCP version 1 (RFC 3525) says it is ITU-T H.248 amendment 1 - (see
Abstract, second para, Last line).

Megaco (RFC 3015) says (Abstract first para, last line) - is common
text with ITU-T
Recommendation H.248

MGCP (RFC 3435) says RFC 3015 is the standards based way to meet the
needs of what MGCP is based to acheive.. then why MGCP??

so GCP == Megaco == H.248  ! = MGCP ?

Now in Vocal system what happens w.r.t Media gateway control, is it
not applicable?
Now when we say VOCAL supports SIP to MGCP translation, does it mean
if you had a Media Gateway doing MGCP then it can be controlled using
such a translation function?

If GCP/Megaco/H.248 is the standard way then why no SIP to Megaco translation?

Someone please clarify.

Regards,
Gmu

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