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412 APPENDIX D: CONNEXTIONS H.323 GATEWAY
Tie-line connections between NBX and PBX systems require technical
people from both ends of the connection to collaborate in these major
areas, discussed next:
■ H.323 Interoperability
■ IP Addressing
■ Voice Ports
■ Extension Dial Plans
■ Extension Delay
H.323 Interoperability
H.323 protocol stacks provide the foundation for H.323 compatibility.
Each consists of a collection of engineered software products that
implements the H.323 standard. Although PBX manufacturers can
develop their own H.323 software stacks, it is more efficient to purchase
software licenses from a company that specializes in developing H.323
protocol stacks.
The ConneXtions gateway has been tested for compatibility with PBX
H.323 gateways that are licensed to use Lucent Elemedia and RADVision
H.323 protocol stacks. It has also been tested with these H.323
telephones:
■ Siemens HiNet LP 5100 (phone application version 1.1.3)
■ ACT Sagitta PH200
■ Microsoft NetMeeting (version 3.0)
IP Addressing
The main goal of an H.323 gateway is to provide telephone-like service
through IP connections. This means each end-to-end connection involves
two types of addresses: a normal telephone number (E.164 address) and
an intermediate IP address. Some H.323 implementations use a
“gatekeeper” to convert the E.164 number into the appropriate
IP address at the calling side, and then to reconvert the IP address to the
E.164 number at the receiving side (for caller ID purposes). ConneXtions
allows you to choose if you want to use a gatekeeper on your network.