VoIP Deployment 

Continued from page: 1

Friday, October 01, 2004

Technical issues in deploying VoIP

Pre-requisites

Gunneswara Rao, Director -VoIP, D-Link India

The following are to be observed/recommended for good and smooth VoIP implementation at each branch/main office of any organization: 

• At each site LAN Network architecture should be such that at least 70% throughput is achievable within less than 10 msec. 
• Round the trip delay of each IP packet on LAN should be less than 10 msec.
• Round the trip delay of each IP packet in LAN and WAN together (that is from any to location to any location with in the organization) should be recommended to be less than 150 msec.
• If the firewalls are present, engineering help needs to be planned for negotiating the VoIP-based packets through these firewalls. 

Integration with existing PBX systems
Existing PBXs may be integrated with the new generation VoIP functionality using available 2-port/4-port VoIP Station Gateways to divert voice traffic from PBX on the existing LAN/WAN instead of the present PSTN. For those organizations wanting to replace existing/old PBX to add new functionality and expansion may do away with any PBX to bring in the IP PBX. These are based on open standards like SIP or H.323.

VoIP Equipment and standards
For VoIP implementation, one may have to plan for the following equipment based on specific site needs:

• VoIP Station Gateways

• LAN-based and Dial-up based IP phones.
• VoIP Trunk Gateways to converge on to the existing PSTN networks.
• Multimedia equipment/sound cards etc., on to PCs only if one wishes to extensively use the PC-based communication, may be in call centers.
• IP PBX/SIP Server/Gatekeeper (H.323) or communication servers based on H.323+SIP protocols. For investment protection one needs to ensure that these are based on open standards like H.323, SIP, H.363/H.364 conferencing so that all future developments and benefits may be taken care with out redeploying such devices. 

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Caution: Any propriety protocol based device deployment in this VoIP region shall cripple the organization during their future expansions.

Difference between VoIP and Data
Any voice communication has 60% silence + 40% useful data. VoIP technology understands this and proper measures have been included in open protocols like SIP or H.323. Plus voice communication is of burst nature while data communication is of study nature. 

Security
There are proven standards and methods available in VoIP technologies, which handle NAT traversal, firewall negotiation, STUN functionality, etc.

Gunneswara Rao, Director -VoIP, D-Link India

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