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Their locations are shown in the map below:
Minimum RTT
The minimum RTT measured from SLAC to the Nigerian hosts are seen below: 
Minimum RTTs > 450ms usually indicates taht the link went via Geostationary Satellite. It is seen that NG.AUN.EDU transitioned to a terrestrial link in 2012, while NG.BENUESTATE.GOV transitioned in 2010.
Throughput
The maximum TCP throughput can be roughly estimated from the loss and average RTT using the Mathis formula. the three metrics are seen in the table below:
Average RTT | Loss | Derived throughput |
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Mean Opinion Score (MOS)
The MOS is a subjectiveness of the quality of speech developed by the Telecommunications industry. 5 is perfect HiFi, 1 is can't hear anything useful. Above ~3.6. is usable. The MOS can be derived from the RTT, jitter and loss.
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It is seen that VoIp calls from SLAC (Stanford university, california, USA) became feasible in 2012.