How to make calls by specifying FXO ports in Grandstream GXW410X and IP PBX UCM63XX May 29, 2025June 12, 2024 by admin Description The document below describes how to make calls using specific FXO ports in Grandstream analog gateway GXW410X peering with IP PBX UCM63XX series. Outbound-route-by-FXO-port-UCM6xxx-and-GXW410xDownload