Analog Fax Initial Configuration on VG450/VG350 with CUCM 12.5

[CS23-]

Hope you're having a great day!
I'm new to cisco (I worked with open-source PBX's and ATA's in the past) and am working to connect an analog Fax machine to my VG450. I normally connect analog pots lines to the VG450 using this config:

subscriber templating
multilink bundle-name authenticated
!
stcapp ccm-group 1
stcapp
!
stcapp feature access-code
!
stcapp feature speed-dial
!
!
!
stcapp supplementary-services
port 1/0/0
fallback-dn 1234567

!----------------------

voice-port 1/0/0
timeouts initial 60
timeouts interdigit 60
timeouts ringing infinity

!----------------------

dial-peer voice 100 pots
service stcapp
port 1/0/0

I've found many articles that give conflicting information so I'm assuming there are many ways to do this. I'm still learning so I don't want to mix and match multiple ways to do because I know that usually messes things up. I just want to know the proper way to configure it with a typical fax machine. I don't have to use `stcapp` to manage it, in fact I'd prefer it to be all on the VG450 if possible. I think that fax-relay is the preferred route, while fax-passthrough is not as reliable. See attached images for my options on the CUCM side with `stcapp` configs. Any information would be helpful, thanks!

Version Information:
CUCM 12.5 (Yes, I will be upgrading to v15 asap)
VG450 - IOS XE 16.10.x
VG450 FXS Port - SM-X-72FXS-SCCP

[Elliot Dierksen]

This may be a bit dated, but I never had good luck with SCCP and analog gateways for fax machines. I have had good luck with MGCP/CUCM on analog gateways.Here is one of my templates I have used for a long time.

no ccm-manager fax protocol cisco               
no mgcp fax t38 inhibit
mgcp package-capability fxr-package
mgcp default-package fxr-package
no mgcp fax t38 ecm
mgcp fax t38 nsf 000000

Re-register the Gateway with CallManager by entering the following commands :

no mgcp
mgcp

[CS23-]

Thanks for this! I'm not familiar with MGCP or SCCP to be completely honest. I inherited the system with SCCP configured. I did manage to find another fax machine already configured with SCCP, but it is set up the same as a POTS phone except with the CUCM fax relay settings enabled.

[Elliot Dierksen]

Other than the long dead VG248, I never had great luck with fax relay and SCCP. Maybe it got better but I was used to doing it via MGCP and didn't have a reason to change. I do believe Cisco's stated direction is away from SCCP, that is just a notion in the back of my head.