NOP from WTL greatly improves the performance of VoIP links. This allows more calls per line or, on shared lines, allows a greater part to be allocated to data.

Standard SIP or H323 based VoIP gateways are normally very wasteful of bandwidth. This is because voice packets from each call are sent in different IP packets each with its own overhead. World Telecom Labs has solved this problem with the creation of NOP (Network Optimization Protocol). This patented technique allows enormous reductions in overhead by combining voice packets from different calls and it leads to great bandwidth savings.
Real world customers are getting commercial voice quality using only 7 Kbps per call with NOP (including overhead)

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