[cisco-voip] VGW IP switch

[Voll, Scott]

I'm just trying to walk it though my head but wanted to bounce it off
everyone and see if any one else has done it and what kind of down time
I'm looking at.

I have a remote site that is connected to the Central site via a T1.
looks like this

						|------- PRI to PSTN
						|
Voice VLAN   --- 10.x.x.1 ------- VGW ------------FR T1 to Central site
						|
Data Vlan ------ 10.y.y.1 ----------|

I am going to move to Metro E and both the Voice and Data Vlan's are
going to terminate on the Router back at the central Site.  There for
the two (V)LAN IP addresses are going to the central router and the T1
Serial IP address is going away.  So I need to change the IP address of
the VGW. To look something like this:

Voice Vlan --- 10.x.x.2 ----- VGW ------ PRI to PSTN.

The VGW is MGCP with CM 4.1.3sr2.  Do I just change the IP address and
it reregisters with CM and I'm only down a couple of minutes or is there
more for me to do?  Do I have to recreate the VGW in CM with the new IP?
How long am I looking at being down?

Thanks for any insight.

Scott