Comparison Matrix: TDMoIP vs. TDMoIP with Compression vs. VoIP

	TDMoIP	TDMoIP Compressed	VoIP
Standards - Toll-quality compression G.711, G.729a, G.723.1	G.711	All	All
Latency - minimum end-to-end	3 ms	45 ms	45 ms
Bandwidth - minimum per voice channel	74 kbps	3.8 kbps*	10.4 kbps*
Transparency - to signaling and protocol
Group III fax relay - 4.8 – 14.4 kbps	>28.8 kbps
Investment protection - current PBX
Maintains features - no staff retraining
T1/T3 extension over IP/Ethernet/MPLS
Bandwidth required	Abundant	Low	Moderate
QoS: sensitivity to latency	Usually High	Usually Low	Usually Low
QoS: sensitivity to packet loss	High	Low	Low
QoS: prioritization required
Single UDP destination port

*Average bandwidth per voice channel with equivalent MAC, IP and UDP overhead (based on system carrying 60 channels of voice with G.723.1 coder, 5.3 kbps compression, 30 ms packetization interval, and 50% silence suppression).

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