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It is important that timing Timing must be consistent between elements of in a VoIP topology. Sourcing the Sonus SBC 1000/2000 Edge clock is critical in keeping the Sonus SBC 1000/2000 Edge synchronized with other elements of the topology. The Sonus SBC 1000/2000 Edge may obtain it's its clock from a network (T1/E1) source such as a PBX or Central Office, or it may use its own internal clock which may itself by synchronized to an NTP source. Where the clock source originates depends entirely on the topology itself and varies on a case-by-case basis.

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