Configuring VG248 for fax

Question

Hi
I have a few questions about configuring fax connected to VG248 (yes, i know its EOL but the end customer hasnt descided to replace them yet).
The setup is like this:
Fax -> VG248 -> CUBE -> SIP-trunk
or i can choose to include the CUCM which would make it look like:
Fax -> VG248 -> CUCM -> CUBE -> SIP-trunk
Should i use T.38, or NSE or?
I have been looking at this:
https://supportforums.cisco.com/docs/DOC-25210
Can i configure all dial-peers on CUCM with both T.38 and NSE so that when the VG248 are replaced i dont have to do any reconfiguring in CUBE?
CUBE
fax protocol t38 nse ls-redundancy 0 hs-redundancy 0 fallback pass-through <g711ulaw or g711alaw>
fax-relay ecm disable
VG248
1) Configure --> Telephony --> Port specific parameters --> Choose the port to which the Fax machine is connected
   a) Set "Fax Relay" to "T.38 peer to peer"
   b) Set "Fax relay ECM" to "disabled"
   c) Set "Fax relay NSF" to "override with 000000"
2) Configure --> Telephony --> Advanced Settings
    Set "Passthrough signaling" to IOS Mode
And here is a problem:
I dont have the choice to set the VG248 port to " fax relay - T.38 peer to peer"
CUCM, CUBE and VG248 are up and running in production so i have to be careful.
Sorry for not being more precise.
Versions:
VG248:  Software version : 1.3(1)
CUBE: 15.1(4)M4
CUCM: 8.0.3.22900-5
CUCM: 8.6.2.22900-9
(there are two different CUCM clusters but both wil have the same setup regarding the fax'es)
/Tony

Answer 1

Craig,
You can achieve this by using COR and multiple dial-peers outbound. Essentially you would apply an inbound dial-peer matching the ANI of your fax on your gateway. This inbound dial-peer would have an incoming cor-list. Then you would add another cor-list to your existing dial-peers, making sure they don't include the fax inbound cor. Then you would duplicate an outbound pattern with a cor-list the faxes can use. Here is an example below, assuming the Fax DN is 1000 with an e164 of 0886441000.
dial-peer cor custom
name faxnumber1000
name longdistance-nofax
dial-peer cor list faxnumber1000
member faxnumber1000
dial-peer cor list longdistance-nofax
member longdistance-nofax
dial-peer voice 1000 voip
description Inbound Fax dial-peer Fax DN 1000
incoming-called number 1000
corlist incoming faxnumber1000
dial-peer voice 11 pots
description Original Outbound LD dialpeer
destination-pattern 9T
clid network-number 0886448580
corlist outgoing longdistance-nofax
port x/x
dial-peer voice 12 pots
description Fax only LD dialpeer
destination-pattern 9T
clid network-number 0886441000
corlist outgoing faxnumber1000
preference 1
port x/x
COR will restrict the fax from ever using the dial-peer with the incorrect CLID. The preference on the fax dial-peer will prevent in most scenarios anyone else using it but you could also apply COR to the remainder of the router to 100% guarantee fax only usage of that dial-peer.
Here is a document explaining COR(note this will discuss how to set it up and not for using it as a workaround to your issue).
http://www.cisco.com/en/US/tech/tk652/tk90/technologies_configuration_example09186a008019d649.shtml
Please rate any helpful posts
Thanks
Fred