When NetTool was connected inline with a Vonage SIP phone, it correctly recorded all the steps in the SIP registration and call proceeding steps. It showed the "invite" with the called number, address and port, the OK, and the setup time. It also recorded the RTP stream statistics including the address, port, TOS (type of service) setting and VLAN tag. It even included the jitter and frame drop count for groups of packets, along with the number of packets used to make the calculation. Agilent's FrameScope provides similar SIP analysis but carries a significantly higher price tag.
Like its predecessors, NetTool provides other helpful network parameters, such as a list of key servers, VLAN IDs, QoS (quality-of-service) levels and ToS bit settings. You can query any switches and routers that are discovered, and get a vast array of SNMP statistics. This feature is available in most tools of this type.
Great Price
NetTool is a bargain for the technician supporting a large Cisco VoIP deployment. Its closest competitor is the Agilent FrameScope Pro. The latter adds several capabilities, including the ability to transmit traffic, both electrical and optical network interfaces, and the ability to simulate SIP calls with prerecorded or live voice. However, the FrameScope costs twice as much as NetTool and is more difficult to use. Most competitors' units are bulkier and more expensive than Fluke's tester.
NetTool ate through four alkaline batteries in about 90 minutes. If you use the recommended rechargeable batteries, it will recharge them from the PoE present in the inline circuit, even when the unit isn't powered up.
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