This link says that Fax-relay is the preferred fax method.
1. Is there a particular reason Cisco recommends this instead of using Pass through,besides using less bandwidth?
2. If I have big enough bandwidth , say OC3 for about 20 sites where the GW will connect to PBX and fax is on the PBX. GW are all Cisco's 28xx. Do you think pass through will be good idea?