I would personally integrate to CCM so you have centrallized dial plan. You will have to configure TCL on the VG to do fax tone detection. This is only required if you want users to have one number for voice and fax.
You said "This is only required if you want users to have one number for voice and fax" --> so if I use different numbers for voice and fax, I don't have to configure TCL? (I have an E1 line and I can take one of the numbers (we have 30 DNs with this line) for fax)
Yes. If you don't want/need to have a single number for voice/fax you do not have to use TCL scripts for tone detection. You just have to create a dial-peer (h.323) or a route pattern (MGCP) to point to the fax server for the group of DNs you want to use for faxing.
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