Hi Vince,
You can disregard your other post, the other post makes it appear that you have H323 directly from your VG224 to CUBE which isn't the case here.
This is your current predicament:
SIP:
Verizon as a SIP provider only supports fax pass-through. They do not support any NSE methods, and they do not support T38.
CUBE:
SIP on CUBE supports all methods.
H323 on CUBE supports all methods.
VG224:
MGCP supports NSE based passthrough and T38, as well as protocol based T38. It does not support pass-through.
In short, Verizon is only going to support G.711 pass-through, and that's not supported on MGCP (or SCCP).
I would suggest switching your VG224 to H323. It's possible to do this with a minimal dial plan. Point all calls from your VG224 to CUCM, and make a dial peer with the particular destination pattern to the VG224.
Once your VG224 is H323:
voice service voip
fax protocol pass-through g711ulaw
Use that on both your VG224 and CUBE.
When Verizon doesn't support T38 it puts a damper on faxing, especially when you're using MGCP.
hth,
nick
