said by HarveyLarva:...... Also, is there any reason, other party VOIP services and my Grandstream HT502 or my Linksys SPA2102 telephone adapters will have problems over this new ATT service? I won't use thier phones, either.
In general the RG is required for authentication with all U-verse VDSL offerings. There is a specific exception for FTTP service if you happen to have FTTP. However since you also purchased U-verse Voice, the RG is also required as it provides the dialtone service.
No problem using any VoIP provider you choose, just understand that only U-verse Voice VoIP is favored by the QoS on the RG. Your third party VoIP traffic will have to complete with other IP traffic.
Dave