IP telephones are shipped from the factory with operational firmware installed. Some system-specific software applications are downloaded from a TFTP or HTTP server through automatic power-up or reset. The IP telephones search and download new firmware from the file server before attempting to register with Communication Manager.

During a Communication Manager upgrade, any data in the /tftpboot directory is overwritten with new software and firmware.

The software treats the 4600-series and 9600-series IP telephones as any new station type, including the capability to list/display/change/duplicate/remove station.

Audio capability for the IP telephones requires the presence of G4xx Media Gateway or Avaya Aura® Media Server. Either of the circuit packs provide hairpinning and IP to IP direct connections. Using a media processor resource conserves TDM bus and timeslot resources and improves voice quality.

To register H.323 endpoints without TTS, at least one connected network region of the IP station must have a PROCR.