As far as I know Asterisk is the only router that does transcoding between call legs including both media and signaling. I have tested only SIP to H323 (GSM to G711).

Cisco will support transcoding beginning with Q3 for 2621XM family (between G729 and G711).

Regards Adrian

Does anyone know of a media proxy that will transcode between g.711 and iLBC?

Thanks, Jamey