An administrator is setting up a remote site in Cisco Unified Communications Manager that has a T1 WAN connection to the main site. Which option is the best VoIP codec for this task?

G.711 is an uncompressed PCM codec requiring 64 kbps per call, which consumes far too much bandwidth on a shared T1 WAN link and is better suited for LAN environments.

G.729 is a compressed voice codec that requires only approximately 8 kbps of bandwidth per call, compared to 64 kbps for G.711. For a remote site connected via a T1 WAN link where bandwidth must be shared among many users and services, G.729 conserves capacity while maintaining acceptable voice quality.

G.712 is not a recognized or standardized VoIP voice codec and is not a valid option in Cisco Unified Communications Manager codec selection.

G.723.1 offers very low bitrates (5.3-6.3 kbps) but introduces higher latency and lower voice quality than G.729, making it less practical and less commonly deployed in enterprise Cisco UC environments.