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Fig 1.

SIP.

(a) Basic components of SIP, (b) How SIP call connects.

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Fig 1 Expand

Table 1.

Examples of SIP messages.

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Table 1 Expand

Table 2.

Examples of SIP responses.

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Table 2 Expand

Fig 2.

WiFi 2.4 GHz channels.

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Fig 2 Expand

Fig 3.

Proposed model.

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Fig 3 Expand

Fig 4.

Secret key acquisition process.

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Fig 4 Expand

Fig 5.

M/M/1 queuing model.

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Fig 5 Expand

Fig 6.

M/M/c queuing model.

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Fig 6 Expand

Fig 7.

W, L of M/M/c without end-end security.

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Fig 7 Expand

Fig 8.

Probability that there is no callers.

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Fig 8 Expand

Fig 9.

Server occupancy.

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Fig 9 Expand

Fig 10.

Effect of AES.

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Fig 10 Expand

Table 3.

Comparison of related studies on SIP.

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Table 3 Expand