Polycom H323-SIP Gateway
At the Polycom User Group meeting in Orlando this week, the company also announced an H.323 to SIP gateway to enable legacy H.323 systems to interoperate with unified communications-oriented applications such as Microsoft OCS, voicemail servers or popular IP PBXs which require SIP support.
This product is not really useful for dual-stack (supports both [[SIP]] and [[H.323]] signalling protocols) devices such as most modern HD and telepresence units, but really enables sophisticated legacy H.323 networks to gradually support SIP applications and services.
Edit